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一维链状4-乙基苯甲酸镧配合物[La(EBA)3(EBAH)(H2O)]n的合成、晶体结构

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2024年4月9日发(作者:郯承嗣)

第26卷第9期 

2010年9月 

无 机 化 学 学 报 

V01-26 No.9 

CHINESE JOURNAL OF INORGANIC CHEMISTRY 

1605.161 1 

维链状4.乙基苯甲酸镧配合物 

[La(EBA)3(EBAH)(H20)1 的合成、晶体结构和性质研究 

杨 娟* 戴 俊 李飞飞 李建通 

f河南理工大学理化学院,焦作454003) 

摘要:水热法合成了配位聚合物『IJa(EBA) (EBAH)(H 0)1 (EBA=4.乙基苯甲酸根,EBAH=4.乙基苯甲酸),并通过X一射线衍射单晶 

结构分析、红外光谱、紫外光谱、荧光光谱以及热重分析对配合物进行了结构和性质研究。配合物属三斜晶系,Pl空间群。该配 

合物具有一维链状结构 La3+离子与9个O原子配位,其中4个O原子来自4个双齿桥联的4.乙基苯甲酸根,3个O原子来自 

2个螯合.桥联的4.乙基苯甲酸根.1个O原子来自1个中性的4.乙基苯甲酸,1个O原子来自配位水分子。La 离子处于九配 

位扭变的--N三角棱柱构型中 相邻 +离子通过双齿桥联或螯合桥联的4.乙基苯甲酸根联结成一维链状结构。存在于分子内 

的氢键使一维链状结构更加稳定 由于相邻一维链的苯环问存在弱的7r…仃堆积作用,使分子沿着a轴堆积形成二维层状结 

构。同时.标题配合物固体具有光致发光特性,蓝光区的较强发射归于配体的7『一7r 电子跃迁。 

关键词:镧配合物;4一乙基苯甲酸;一维链;晶体结构;荧光 

中图分类号:O614.33 1 文献标识码:A 文章编号:1001—4861(2010)09—1605—07 

Synthesis,Crystal Structure and Properties Study of 1D Chain-Like 

Lanthanum 4-ethylbenzoate Complex[La(EBA)3(EBAH)(HzO)] 

YANG Juan DAI Jun LI Fei—Fei LI Jian—Tong 

(Department ofPhysical Chemistry,Henan Polytechnic University,Jiaozuo,Henan 454003) 

Abstract:The coordination polymer[La(EBA)3(EBAH)(H20)] (EBA=4一ethylbenzoate,EBAH=4一ethylbenzoic acid) 

was synthesized by hydrothermal method in the presence of melamine and characterized by X—ray single crystal 

structural analysis, IR spectum,r UV spectum,r fluorescence spectrum, and thermogravimetric analysis.The 

complex crystallizes in triclinic crystal system and P1 space group with the cell dimensions:a=0.953 1 9(3)nm, 

b=1.403 78(5)nm,c=1.498 47(5)nm,a=65.024(2)。,/3=74.942(2)。,T=74.734(2)。.The complex has 1D chain—like 

stuctrure.La ion is nine—coordinated by four oxygen atoms from four bridging—bidentate 4-EBA ligands,three 

oxygen atoms from two chelating—bridging 4-EBA ligands,one oxygen atom from one neutral 4-EBAH ligand and 

one from the coordinated water molecule in a distorted tricapped trigonal—prismatic geomety.The adjacentr La。 

ions are linked by the carboxylate groups of 4-EBA ligands in the bridging--bidentate or chelating・・bridging 

coordination mode,resulting in an infinite chain stuctrure.The hydrogen bonds involving the water molecules, 

carboxylate groups and carboxyl H atoms are formed within the one-dimensional polymer.Viewed along U axis, 

two kinds of weak彳r…7r interactions between the benzene rings of the neighboring chains connect the paralleling 

1D chain into 2D layer stuctrure.The luminescent property in solid state of complex was also studied and 

discussed.The intense blue fluorescence emission of the complex is attibutred to the 7r— 7r electron transition of 

the ligands.CCDC:764123. 

Key words:lanthanum complex;4-ethylbenzoic acid;1 D chain—like;crystal structure;fluorescence 

收稿日期:2010—02—16。收修改稿日期:2010—05.24。 

国家自然科学基金(N0.20901028) ̄I南理工大学博士基金(No.B2008.58648265)资助项目。 

通讯联系人。E.mail:yangjuan0302@yahoo.(3/1 

第一作者:杨娟,女,3O岁,博士,副教授;研究方向:无机材料及功能配合物。

. 

无机化学学报 第26卷 

0 Introduction 

There has been cons iderable interest in coordina- 

tion polymers based on metal centers and muhifunc— 

tional bridging ligands due to their fascinating struc— 

tures and promising applications in practical areas such 

as catalysis,magnetism,non-linear optics,sensors and 

separation[ ~.To the best of our knowledge carboxylate 

coordinates metal in various ways,for example,in the 

mode of monodentate,bidentate chelating,bidentate 

bridging or chelatin bridging.Lanthanide ions,beca 

use of the high and variety coordination numbers,their 

carboxylate complexes display a variety of amusing 

structures[ ̄1

. 

As rigid ligands,benzoic acid and its derivatives 

have been widely used because they can bridge the 

center ions and form the仃.订stacking to increase the 

stability of the structure.Different substituents or 

different positions of the substituents on the benzene 

ring result in various sturctures of the lanthanide 

complexes.For example,many lanthanide complexes 

with benzoic acid or its derivatives containing phen or 

2.2 .bipy formed the dimeric unit with coordination 

number of eight or nine[5-7】.However。lanthanide compl- 

exes with only monoacid ligand were usually obtained 

in the form of coordination polymer and this kind of 

complexes has higher thermal stability and strong 

lfuorescence properties[S-91.With the aim of preparing 

stbale functional polymer,we used 4-ethylbenzoic acid 

(4.EBAH)as ligand in the presence of melamine,and 

obtained a new one-dimensional polymeric[La(EBA)3 

(EBAH)(H2O)] prepared by hydrothermal method.The 

crystal structure,luminescent properties and thermal 

stability of the complex are reported in this paper. 

1 Experimental 

1.1 Reagents and general methods 

La(N03)3"6H20,4-ethylbenzoic acid(4-EBAH), 

melamine。DMF and DMSO are analytically pure grade 

and used as received.Elemental fC and H)analysis was 

Derformed on a Perk in—Elmer 2400LS analyzer. 

Infrared spectra were collected with a阿R Thermo 

Nicolet Impact 4 1 0 spectrometer with KBr pellets in the 

4 000~400 cm~regions.The UV-Vis spectra were 

measured in DMF solvent f 1 mmo卜L 1 by a UV.260 

spectrophotometer.Excitation and luminescent spectra 

ofr the powdered solid samples were recorded at room 

temperature on a Hitachi F.4500 fluorescence spectro. 

lfuorometer(the pass width is 5.0 nm).Thermogravi- 

metric analysis was conducted on a Perkin Elmer TG.7 

with a heating rate of 10 oC・min一 from 3O to 700 oC in 

air. 

1.2 Synthesis of[La(EBA)3(EBAH)(H O) 

A mixture of La(NO3)3・6H20(0.52 mmo1),4- 

EBAH fO.84 mmol1 and melamine (0.4 mmo1)was 

added to 1 0 mL distilled water,and pH of the resultant 

mixture was 5.5—6.5.The reaction mixture was trans— 

ferred to the 25 mL staiuless Teflon—lined autoclave and 

heated at 423 K under autogenous pressure for 7 d. 

After cooled to room temperature,the colorless prism 

crystals were separated from the mixture,washed with 

cold deionized water and dried at 350 K for 10 h in air. 

The yield was about 58%based on La203.The obtained 

complex is hardly soluble in water,methanol, 

anhydrous ethanol and acetonitrile,but facilely soluble 

in DMF and DMSO.Ana1.Calcd.for C36H3909La(%):C 

57.3O H 5.21:found(%):C 57.04,H 5.46. 

1.3 X.ray crystal structure determination 

A colorless prismatic crystal with dimensions of 

0.35 minx0.32 mmx0.23 mm was put on Bruker SMART 

APEX 11 CCD diffractometer equipped with a graphite 

mo.nochromatized Mo radiation =0.07 1 073 nm) 

by using 一 scan mode at 296(2)K.Total of 22 559 

reflections were collected in the range of 1.63。≤ ≤ 

27.43o.of which 7 733 were independent with Rjm=0.050, 

and 6 206 with I>o-∽were considered as observed. 

Semi—empirical absorption correction was applied to the 

intensity data using the SADABS program[ .The struc— 

ture was solved by direct methods and refined by full— 

matrix least.square on F using the SHELXTL-97 pr0g— 

ram[ ”

A11 non.hydrogen atoms were refined anisotropi— 

cally.A11 H atoms bounded to C atoms were generated 

geometrically and refined isotropically using the riding 

node.The hydrogen atoms of water molecule and the 

carboxylic H atom were located in a difference Fourier 

map.The ethyl group C8-C9 was treated as disordered 

over two sites,with、refined occupancies 0.7 14(7)and 

第9期 杨娟等:一维链状4-乙基苯甲酸镧配合物【【丑(EBA) (EBAH)(H:O)l 的合成、晶体结构和性质研究 1607 

O.286(7).A summary of crystal data and details of the 

structure refinements are listed in Table 1. 

CCDC:764123. 

Table 1 Crystal data and structure refinement for the title complex 

Empirical formula 

Formula weight 

C {∞OqLa 

754.58 

V/nm 

D/(g・m ) 

1.727 91(10) 

1.450 

Temperature/K 

Wavelength/nnl 

Crystal system 

296(2) 

O.07 1 073 

Triclinic 

///'ia一r 

F(O00) 

Crystal size/mnl 

J.288 

768 

0.35x0.32 ̄0.23 

Space group PI 0 range for data collection/(。) 1.63 to 27.43 

a/f1m 

b/flln 

c/llln 

0t/(。) 

O.953 19(31 

1.403 78(5) 

1.498 47(5) 

65.024(2) 

Reflections collected 

Independent reflections ) 

22 559 

7 733(O.050) 

6206 

1.014 

Observed renecti0ns【,>2 (|『)] 

Final GooF 

卢/(。) 

.y/(。) 

Z 

74.942(2) 

74.734(2) 

2 

R1,wR2【,>2 (川

R1,wR2(all data)

Largest different peak and hole/e-nm一’ 

0.038 2,0.070 9 

0.054 8,O.077 2 

676,一737 

2 Results and discussion 

the carboxyl f03一C 1 0.O41 adopts the monodentate 

mode in form of neutral 4一EBAH. 

2.1 Crystal structure of【La(EBA)3(EBAH)(H2o)】 

The repI。esentative structure of the complex 

Each La(皿ion is coordinated with nine oxygen 

atoms,in which four oxygen atoms from four bridging- 

bidentate 4-EBA ligands,three oxygen atoms from two 

including the atomic numbering scheme is described in 

Fig.1.The prominent characteristic is the 1 D chain.in 

which the center La3 ions act as nodes and are conn— 

ected through 4一EBA ligands.Carboxyls fO 1-C 1—02 

chelating—bridging 4一EBA ligands,one oxygen atom 

rom one neutralf 4-EBAH ligand and one from the 

and 07一C28—08)adopt bidentate-bridging coordination 

fashion,namely,the two oxygen atoms coordinate to two 

coordinated water molecule.So each La0 ion lies in a 

distorted tricapped trigonal—prismatic coordination 

different La ions.Carboxyl f05.C 19—061 adopts the 

chelating—bridging coordination mode,in which 05 and 

06 coordinate to one La ion by chelating fashion and 

environment(Fig.2).Atoms 02 ,08 and 05 construct 

the upper plane of the distorted trigonal prism and 

atoms 01,06i and 07i form the below one,with the 

dihedral angle of 5.744。between them.The 09.03 and 

06 atoms are at the vertices of each square pyramid. 

06 simultaneously hridges with another La ion.While 

Symmety codesr used to generate equivalent atoms: I q

1 ;”2-x,-y,l-z 

_y 

Symmetry codes:‘1 ,-y,1-z; 。2 ,-y,l 

Fig.1 Molecular structure of the complex 

Fig.2 Coordination polyhedron of the title complex 

无机化学学报 第26卷 

And the mean distance from the upper and lower plane 

is 0.322 8 nm. 

bonds are all intramoleculy.ia.e.stabilize the one— 

dimensional chain structure of the polymer,as 

indicated in Fig.3.Additionally.at the same side of 1D 

chain,the benzene rings of 4-EBA ligands or 4-EBAH 

ligand parallel each other and the shortest ve ̄ical 

The adjacent LaⅢions aye linked by the cayboxy. 

1ate groups of 4-EBA ligands in the bridging-bidentate 

or chelating—bridging coordination mode,resulting in an 

infinite chain structure Mong the b axis.The distance 

distance of the corresponding adjacent benzene tings 

are 0.560 8.0.680 3.0.578 l and 0.43l 4 nm for the 

between two adjacent La3 ions is 0.426 05(3)nm for 

Lali…Lal and O.545 10(31 nm for Lal…Lal .And the 

angle of Lal …Lal…Lal i is 157.753(6)。.The bond 

lengths of Lal-O,except for Lal一06,range from 

0.244 7(2)to 0.267 2(2)nm,with a mean value of 0.252 2 

nm.which aye rational as literatures reposed【 . 

Whereas,the rather long Lal一06 distance of 0.298 9(2) 

nm oversteps the average length of La—O bond【 埘. 

And the bond angles of O—Lal—O(carboxy1)range from 

45.65(7)。to 154.20(7)。. 

As shown in Table 3,the coordinating water, 

cayboxylate oxygen atoms of 4-EBA ligands and 

carboxylic H atom of 4-EBAH ligand are involved in 

7 

9 

7 

8 

3 

7 

7 

8 

2 

2 

8 

3 

3 

8 

1 0 

8 

8 8 

8 

4 5 

8 

O 2 

7 

5 

7 

0 2 

8 

7 9 

8 

O-H…O hydrogen-bonding interactions r09-H9B… 

Fig.3 Intramolecular hydrogen bonds of extended 

chain—like stuctrure along the b axis 

02,04-H4A…05).Furthermore,these hydrogen 

Table 2 Selected bond lengths(nn1)and angles(。)for the complex 

La1—07 

0.244 7(2) 

0.245 2(2) 

Lal—O8 

La1.05 

0.247 9(21 

Lal一09 

La1.03 

La1.06 

0.262 4(2) 

0.267 2(2) 

0.298 9(2) 

Lal—O1 

Lal一02 

0.258 1(2) 

0.246 6(2) 

0.245 7(2) 

Lal—O6 

O7i-Lal—O1 

O7 .La1.02 

85.28(8) 

138.38(8) 

88.76(7) 

72.12(8) 

06 .La1.O8 

O7i-Lal一05 

01.La1.05 

O2ii_La1.05 

06’.La1.O9 

08.La1。O9 

O5.La1一O9 

O7 一Lal一03 

75.51(8) 

65.78(8) 

141.11(8) 

70.76(8) 

67.79(8) 

O1.La1.02 

O7l-La1.O6 

0l-La】.O6 

O2 一La1 06— 

07LLa1.O8 

O1.I丑1—08 

88.38(8) 

148.91(8) 

O6 一La1。O5 

O1.Lal—O3 

O8.Lal一05 

OT-Lal—O9 

O1.Im1一O9 

02ii_Lal一09 

O8一La1.06 

05.La1.O6 

O9.La1一O6 

O2ii—La1.03 

O6j-Lal一03 

08一Lal一03 

05.La1.03 

68.89(8) 

137.01(8) 

142.87(8) 

69.82(7) 

129.47(8) 

134.89(8) 

81.26(8) 

122.91(7) 

69.86(7) 

O2ii.La1—08 

O9一La1—03 

07 一La1—06 

O6i.La1.06 

02 .La1.06 

O3一Lal一06 

77.73(7) 

1 14.27(7) 

108.39(7) 

O1.La1.O6 

154.20(7) 

Symmetry codes used to generate equivalent atoms: 1-x,-y,l-z; 2 ,一Y,1-z 

Table 3 Hydrogen bond lengths and angles 

第9期 杨娟等:一维链状4-乙基苯甲酸镧配合物[La(EBA)3(EBAH)(H 0)] 的合成、晶体结构和性质研究 

nm,0=0.233。,in which Cg is the ring centroid,dc.c is 

the centroid-centroid distance,dp P is the vertical 

distance,and 0 is the dihedral angle of two neighboring 

C2-C4-C6,C1 1一C13-C15,C20-C22-C24 and C29-C31一 

C33,respectively.Therefore,there is no obvious 7r…7r 

packing effect within the one—dimensional polymer 

although the benzene rings parallel highly each other. 

To some extent,the structure of the title complex 

7r—planes【l8】.Similarly,the benzene ring(C20,C2 1, 

C22,C23,C24,C25)and the neighboring B ring are 

also parallel highly with dc ̄c=0.394 1 2 nm,dP_P=0.356 02 

nm.0:O。.The weak 7『…7r stacking interactions 

is similar to that of complex[Eu(2・IBA)3・H20] (2-IBA= 

2-iodobenzoate) .The latter complex is also 1 D polymer 

chain structure,in which Eu ions are connected 

through two carboxyl groups of two 2・IBA ligands via 

the bridging--chelating・-bridging tetradentate coordina・・ 

tion mode.In the structure of 1 D chain polymer 

[Eu(2,4-DC1BA)3・(CH3CH2OH)2] (2,4-DC1BA=2,4一 

dichlorobenzoate)t .each Eu ion is eight.coordinated 

with four oxygen atoms of four bidentate--bridging 2,4-- 

DC1BA anions,two oxygen atoms of one bidentate— 

chelating 2,4一DC1BA anion and two atoms of two 

ethanol molecules.Unlike the title complex,in the 1 D 

polymeric chain of[Tb(3-IBA)3(H20)2・0.5(4,4 bipy)] 

(3-IBA=3一iodobenzoate;4,4 一bipy=4,4 bipyridine), 

each Tb ion is connected through four bidentate 

bridging 3-IBA ligands and lies in a distorted square- 

antiprism geometry.The 4,4 一bipy molecule in the 

crystal lattice does not coordinate to Tb ion【垌.In the 

dinuclear complex of{La[o—C6H4(NO2)(CO2)]3・(DMF)2}2 

o-nitro-benzoic acid),two La㈣ions are bridged by 

four 0一nitro-benzoic acid ligands with their carboxyls 

and occupy the nine coordination sites,in which two 

carboxyl groups adopt bidentate—bridging coordination 

mode and the other two take monodentate—bridging 

mode【l7】.Obviously.the distinct difference from the ifnal 

sturctures of these coordination complexes may be 

caused by the different ligands,for example,the 

different substituent groups or the different position 

locating in the benzene rings. 

In addition,each unit cell is packed by six 1 D 

polymeric chains along a axis.These 1D chains parallel 

each other with the shortest distance between the 

adjacent La of 1.474 63(6)nm and 1.498 47(6)nm. 

Moreover,there are two kinds of inter.molecular 7r…7r 

interactions between the benzene rings of neighboring 

polymeric chains.As shown in Fig.4,the benzene ring 

(C1 1,C12,C13,C14,C15,C16)and the adjacent A 

irng are parallel with dc-c=0.377 35 nm,dp

p=O.306 32 

assemble the neighboring 1D chains into the two— 

dimensional layer structure paralleling to bc plane for 

the title complex. 

Fig.4 Arrangement of the仃…仃stacking interactions 

paralleling to bc plane of the title compound 

2.2 IR and UV spectrum of the title complex 

The IR specturm of the complex was determined in 

the range of 4 000-400 cm—as KBr pellets.Compared 

with the 4一EBAH ligand,the IR spectral intensity of the 

complex around l 7 10 cm~is significantly weakened, 

which is observed for the—COOH【捌.It demonstrates 

that there are several different coordinating fashions of 

the carboxylate groups in the complex,including the 

deprotonated anions and the neutral molecule.Another 

feature of the IR data of the complexes iS the separation 

between v ̄(COO)and vs(coo-),which have often been 

used to discuss the coordination mode of carboxylate 

group in the carboxylate complexes.Two strong 

peaks at 1 532 and l 383 em一 could be assigned to the 

(C00一)and/Ys(coo一)stretching vibration of carboxyl 

1610 无机化学学报 第26卷 

in 4-EBA ligand.The Av[v (COO一)-v (COO一)]of 149 

am一 suggests that the coordination of the carboxylate 

groups is most probably of the bridging type ,which is 

also supported by the results from single-・crystal X・-ray 

diffraction data.Peaks observed at 2 985~2 846 cm-1 

are in good agreement with C-H vibrations.and the 

wide absorption peak at about 3 405 cm一 is assigned to 

the vibrations of water molecules.The weak band at 

435 am—may be assigned to the vibrations of La—O 

bond{2tJ. 

The UV spectra of the free ligand and the complex 

were recorded in DMF solvent with the concentration of 

1 mmol・IJ_ .Both of the spectra have one strong absorp— 

tion peak at 272 nm attributing to 7r 7r transition. 

however,the intensities are different.The absorption 

intensity of the complex =1.51 xl0。)is evidently 

stronger than that of free 4-EBAH ligand(e=0.72x 103), 

which is attributed to the coordination between the 

ligands and the center La3 ions.Owing to the formation 

of complex,the degree of conjugation and intensities of 

UV absorption obviously increased. 

2.3 Luminescent properties 

The solid state fluorescence spectrum of the 

complex was measured at room temperature.The 

excitation specturm was recorded in the range of 250- 

400 am,setting 449 nm as the emission wavelength,in 

which there is a strong peak at 335 nm.In contrast to 

the weak luminescence of the free ligand,the complex 

exhibits one strong band centered at 449 nm excited at 

335 nm in the solid state(Fig.5).Since there are no 4f 

electrons and the energy level of excited states below 

the tirplet levels of the ligand for La㈣ions the energy 

Wavelength/ilm 

Fig.5 Excitation(a)and emission(b)spectra of the 

complex in the solid state 

absorbed by the 4-EBA ligand cannot transfer to La㈣ 

ions.The absorbed energy can only relax through its 

own eneryg levels.The intense blue fluorescence 

emission of the complex is attributed to the enhanced 

7r electron transition of the ligand.Therefore.the 

complex emits the ligand.centered lfuorescence. 

2.4 Thermogravimetric analysis 

The TG—DSC analysis was performed in air 

atmosphere with a heating rate of 10 oC・min in tlle 

temperature range from 30 to 700℃.The results indic. 

ate that the complex involve two steps of weight losses. 

The first weight loss of 2.26%from 30 to 246℃ 

corresponds to the coordinated water molecule fcalcul— 

ated 2.39%1.The next mass reduction of 74.79%occurs 

in the range 246-625 oC and shows two apparent 

exothermie peaks,corresponding to the removal of 

organic ligands.The weight of the residue is 22.95%. 

Supposing La203 as final residue,calculated residue 

weight of the complex is 21.59%,which is in coincide- 

nce with experimental value.Results indicate that the 

complex is degraded to oxide,completely. 

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第9期 杨娟等:一维链状4-乙基苯甲酸镧配合物【La(EBA)3(EBAH)(H:0)] 的合成、晶体结构和性质研究 

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Huaxue Xuebao),2006。27f2):199.203 

『18]Janiak C..J=Chem.Soc.,Dalton Trans.,2000:3885-3896 

(潘文丽).Chinese lnorg.Chem.(wuji Huaxue Xuebao), 

【19]Bellamy L J.The Infrared spectra of Complex Molecules. 

New York:Wiley,1958. 

【14lLi X,Ju Y L,Zou Y Q. Coord.Chem.,2007,60(14):1513- 

1526 

【151LI Yun-Feng(李云峰),WANG Chun.Yan(王春燕),LI Xia( ̄ 

夏).Chiense Inorg.Chem.(wuji Huaxue Xuebao),2008,24 

(8):1311-1315 

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【20]Nakamoto K.Inrfared and Raman 5ipectra ofInorganic and 

Coordination Compounds:只 B.5th Ed.New York:Wiley. 

1997.59.62 

[21]XIAN Chun.Ying0= ̄春颖),ZHU Long.Guan( ̄龙观),YU 

Qing—Sen(俞庆森).Chem.tJ=Chiense Universities(Gaodeng 

Xuexiao Huaxue Xnebao),1999,20(1 01:1504.1508 

2024年4月9日发(作者:郯承嗣)

第26卷第9期 

2010年9月 

无 机 化 学 学 报 

V01-26 No.9 

CHINESE JOURNAL OF INORGANIC CHEMISTRY 

1605.161 1 

维链状4.乙基苯甲酸镧配合物 

[La(EBA)3(EBAH)(H20)1 的合成、晶体结构和性质研究 

杨 娟* 戴 俊 李飞飞 李建通 

f河南理工大学理化学院,焦作454003) 

摘要:水热法合成了配位聚合物『IJa(EBA) (EBAH)(H 0)1 (EBA=4.乙基苯甲酸根,EBAH=4.乙基苯甲酸),并通过X一射线衍射单晶 

结构分析、红外光谱、紫外光谱、荧光光谱以及热重分析对配合物进行了结构和性质研究。配合物属三斜晶系,Pl空间群。该配 

合物具有一维链状结构 La3+离子与9个O原子配位,其中4个O原子来自4个双齿桥联的4.乙基苯甲酸根,3个O原子来自 

2个螯合.桥联的4.乙基苯甲酸根.1个O原子来自1个中性的4.乙基苯甲酸,1个O原子来自配位水分子。La 离子处于九配 

位扭变的--N三角棱柱构型中 相邻 +离子通过双齿桥联或螯合桥联的4.乙基苯甲酸根联结成一维链状结构。存在于分子内 

的氢键使一维链状结构更加稳定 由于相邻一维链的苯环问存在弱的7r…仃堆积作用,使分子沿着a轴堆积形成二维层状结 

构。同时.标题配合物固体具有光致发光特性,蓝光区的较强发射归于配体的7『一7r 电子跃迁。 

关键词:镧配合物;4一乙基苯甲酸;一维链;晶体结构;荧光 

中图分类号:O614.33 1 文献标识码:A 文章编号:1001—4861(2010)09—1605—07 

Synthesis,Crystal Structure and Properties Study of 1D Chain-Like 

Lanthanum 4-ethylbenzoate Complex[La(EBA)3(EBAH)(HzO)] 

YANG Juan DAI Jun LI Fei—Fei LI Jian—Tong 

(Department ofPhysical Chemistry,Henan Polytechnic University,Jiaozuo,Henan 454003) 

Abstract:The coordination polymer[La(EBA)3(EBAH)(H20)] (EBA=4一ethylbenzoate,EBAH=4一ethylbenzoic acid) 

was synthesized by hydrothermal method in the presence of melamine and characterized by X—ray single crystal 

structural analysis, IR spectum,r UV spectum,r fluorescence spectrum, and thermogravimetric analysis.The 

complex crystallizes in triclinic crystal system and P1 space group with the cell dimensions:a=0.953 1 9(3)nm, 

b=1.403 78(5)nm,c=1.498 47(5)nm,a=65.024(2)。,/3=74.942(2)。,T=74.734(2)。.The complex has 1D chain—like 

stuctrure.La ion is nine—coordinated by four oxygen atoms from four bridging—bidentate 4-EBA ligands,three 

oxygen atoms from two chelating—bridging 4-EBA ligands,one oxygen atom from one neutral 4-EBAH ligand and 

one from the coordinated water molecule in a distorted tricapped trigonal—prismatic geomety.The adjacentr La。 

ions are linked by the carboxylate groups of 4-EBA ligands in the bridging--bidentate or chelating・・bridging 

coordination mode,resulting in an infinite chain stuctrure.The hydrogen bonds involving the water molecules, 

carboxylate groups and carboxyl H atoms are formed within the one-dimensional polymer.Viewed along U axis, 

two kinds of weak彳r…7r interactions between the benzene rings of the neighboring chains connect the paralleling 

1D chain into 2D layer stuctrure.The luminescent property in solid state of complex was also studied and 

discussed.The intense blue fluorescence emission of the complex is attibutred to the 7r— 7r electron transition of 

the ligands.CCDC:764123. 

Key words:lanthanum complex;4-ethylbenzoic acid;1 D chain—like;crystal structure;fluorescence 

收稿日期:2010—02—16。收修改稿日期:2010—05.24。 

国家自然科学基金(N0.20901028) ̄I南理工大学博士基金(No.B2008.58648265)资助项目。 

通讯联系人。E.mail:yangjuan0302@yahoo.(3/1 

第一作者:杨娟,女,3O岁,博士,副教授;研究方向:无机材料及功能配合物。

. 

无机化学学报 第26卷 

0 Introduction 

There has been cons iderable interest in coordina- 

tion polymers based on metal centers and muhifunc— 

tional bridging ligands due to their fascinating struc— 

tures and promising applications in practical areas such 

as catalysis,magnetism,non-linear optics,sensors and 

separation[ ~.To the best of our knowledge carboxylate 

coordinates metal in various ways,for example,in the 

mode of monodentate,bidentate chelating,bidentate 

bridging or chelatin bridging.Lanthanide ions,beca 

use of the high and variety coordination numbers,their 

carboxylate complexes display a variety of amusing 

structures[ ̄1

. 

As rigid ligands,benzoic acid and its derivatives 

have been widely used because they can bridge the 

center ions and form the仃.订stacking to increase the 

stability of the structure.Different substituents or 

different positions of the substituents on the benzene 

ring result in various sturctures of the lanthanide 

complexes.For example,many lanthanide complexes 

with benzoic acid or its derivatives containing phen or 

2.2 .bipy formed the dimeric unit with coordination 

number of eight or nine[5-7】.However。lanthanide compl- 

exes with only monoacid ligand were usually obtained 

in the form of coordination polymer and this kind of 

complexes has higher thermal stability and strong 

lfuorescence properties[S-91.With the aim of preparing 

stbale functional polymer,we used 4-ethylbenzoic acid 

(4.EBAH)as ligand in the presence of melamine,and 

obtained a new one-dimensional polymeric[La(EBA)3 

(EBAH)(H2O)] prepared by hydrothermal method.The 

crystal structure,luminescent properties and thermal 

stability of the complex are reported in this paper. 

1 Experimental 

1.1 Reagents and general methods 

La(N03)3"6H20,4-ethylbenzoic acid(4-EBAH), 

melamine。DMF and DMSO are analytically pure grade 

and used as received.Elemental fC and H)analysis was 

Derformed on a Perk in—Elmer 2400LS analyzer. 

Infrared spectra were collected with a阿R Thermo 

Nicolet Impact 4 1 0 spectrometer with KBr pellets in the 

4 000~400 cm~regions.The UV-Vis spectra were 

measured in DMF solvent f 1 mmo卜L 1 by a UV.260 

spectrophotometer.Excitation and luminescent spectra 

ofr the powdered solid samples were recorded at room 

temperature on a Hitachi F.4500 fluorescence spectro. 

lfuorometer(the pass width is 5.0 nm).Thermogravi- 

metric analysis was conducted on a Perkin Elmer TG.7 

with a heating rate of 10 oC・min一 from 3O to 700 oC in 

air. 

1.2 Synthesis of[La(EBA)3(EBAH)(H O) 

A mixture of La(NO3)3・6H20(0.52 mmo1),4- 

EBAH fO.84 mmol1 and melamine (0.4 mmo1)was 

added to 1 0 mL distilled water,and pH of the resultant 

mixture was 5.5—6.5.The reaction mixture was trans— 

ferred to the 25 mL staiuless Teflon—lined autoclave and 

heated at 423 K under autogenous pressure for 7 d. 

After cooled to room temperature,the colorless prism 

crystals were separated from the mixture,washed with 

cold deionized water and dried at 350 K for 10 h in air. 

The yield was about 58%based on La203.The obtained 

complex is hardly soluble in water,methanol, 

anhydrous ethanol and acetonitrile,but facilely soluble 

in DMF and DMSO.Ana1.Calcd.for C36H3909La(%):C 

57.3O H 5.21:found(%):C 57.04,H 5.46. 

1.3 X.ray crystal structure determination 

A colorless prismatic crystal with dimensions of 

0.35 minx0.32 mmx0.23 mm was put on Bruker SMART 

APEX 11 CCD diffractometer equipped with a graphite 

mo.nochromatized Mo radiation =0.07 1 073 nm) 

by using 一 scan mode at 296(2)K.Total of 22 559 

reflections were collected in the range of 1.63。≤ ≤ 

27.43o.of which 7 733 were independent with Rjm=0.050, 

and 6 206 with I>o-∽were considered as observed. 

Semi—empirical absorption correction was applied to the 

intensity data using the SADABS program[ .The struc— 

ture was solved by direct methods and refined by full— 

matrix least.square on F using the SHELXTL-97 pr0g— 

ram[ ”

A11 non.hydrogen atoms were refined anisotropi— 

cally.A11 H atoms bounded to C atoms were generated 

geometrically and refined isotropically using the riding 

node.The hydrogen atoms of water molecule and the 

carboxylic H atom were located in a difference Fourier 

map.The ethyl group C8-C9 was treated as disordered 

over two sites,with、refined occupancies 0.7 14(7)and 

第9期 杨娟等:一维链状4-乙基苯甲酸镧配合物【【丑(EBA) (EBAH)(H:O)l 的合成、晶体结构和性质研究 1607 

O.286(7).A summary of crystal data and details of the 

structure refinements are listed in Table 1. 

CCDC:764123. 

Table 1 Crystal data and structure refinement for the title complex 

Empirical formula 

Formula weight 

C {∞OqLa 

754.58 

V/nm 

D/(g・m ) 

1.727 91(10) 

1.450 

Temperature/K 

Wavelength/nnl 

Crystal system 

296(2) 

O.07 1 073 

Triclinic 

///'ia一r 

F(O00) 

Crystal size/mnl 

J.288 

768 

0.35x0.32 ̄0.23 

Space group PI 0 range for data collection/(。) 1.63 to 27.43 

a/f1m 

b/flln 

c/llln 

0t/(。) 

O.953 19(31 

1.403 78(5) 

1.498 47(5) 

65.024(2) 

Reflections collected 

Independent reflections ) 

22 559 

7 733(O.050) 

6206 

1.014 

Observed renecti0ns【,>2 (|『)] 

Final GooF 

卢/(。) 

.y/(。) 

Z 

74.942(2) 

74.734(2) 

2 

R1,wR2【,>2 (川

R1,wR2(all data)

Largest different peak and hole/e-nm一’ 

0.038 2,0.070 9 

0.054 8,O.077 2 

676,一737 

2 Results and discussion 

the carboxyl f03一C 1 0.O41 adopts the monodentate 

mode in form of neutral 4一EBAH. 

2.1 Crystal structure of【La(EBA)3(EBAH)(H2o)】 

The repI。esentative structure of the complex 

Each La(皿ion is coordinated with nine oxygen 

atoms,in which four oxygen atoms from four bridging- 

bidentate 4-EBA ligands,three oxygen atoms from two 

including the atomic numbering scheme is described in 

Fig.1.The prominent characteristic is the 1 D chain.in 

which the center La3 ions act as nodes and are conn— 

ected through 4一EBA ligands.Carboxyls fO 1-C 1—02 

chelating—bridging 4一EBA ligands,one oxygen atom 

rom one neutralf 4-EBAH ligand and one from the 

and 07一C28—08)adopt bidentate-bridging coordination 

fashion,namely,the two oxygen atoms coordinate to two 

coordinated water molecule.So each La0 ion lies in a 

distorted tricapped trigonal—prismatic coordination 

different La ions.Carboxyl f05.C 19—061 adopts the 

chelating—bridging coordination mode,in which 05 and 

06 coordinate to one La ion by chelating fashion and 

environment(Fig.2).Atoms 02 ,08 and 05 construct 

the upper plane of the distorted trigonal prism and 

atoms 01,06i and 07i form the below one,with the 

dihedral angle of 5.744。between them.The 09.03 and 

06 atoms are at the vertices of each square pyramid. 

06 simultaneously hridges with another La ion.While 

Symmety codesr used to generate equivalent atoms: I q

1 ;”2-x,-y,l-z 

_y 

Symmetry codes:‘1 ,-y,1-z; 。2 ,-y,l 

Fig.1 Molecular structure of the complex 

Fig.2 Coordination polyhedron of the title complex 

无机化学学报 第26卷 

And the mean distance from the upper and lower plane 

is 0.322 8 nm. 

bonds are all intramoleculy.ia.e.stabilize the one— 

dimensional chain structure of the polymer,as 

indicated in Fig.3.Additionally.at the same side of 1D 

chain,the benzene rings of 4-EBA ligands or 4-EBAH 

ligand parallel each other and the shortest ve ̄ical 

The adjacent LaⅢions aye linked by the cayboxy. 

1ate groups of 4-EBA ligands in the bridging-bidentate 

or chelating—bridging coordination mode,resulting in an 

infinite chain structure Mong the b axis.The distance 

distance of the corresponding adjacent benzene tings 

are 0.560 8.0.680 3.0.578 l and 0.43l 4 nm for the 

between two adjacent La3 ions is 0.426 05(3)nm for 

Lali…Lal and O.545 10(31 nm for Lal…Lal .And the 

angle of Lal …Lal…Lal i is 157.753(6)。.The bond 

lengths of Lal-O,except for Lal一06,range from 

0.244 7(2)to 0.267 2(2)nm,with a mean value of 0.252 2 

nm.which aye rational as literatures reposed【 . 

Whereas,the rather long Lal一06 distance of 0.298 9(2) 

nm oversteps the average length of La—O bond【 埘. 

And the bond angles of O—Lal—O(carboxy1)range from 

45.65(7)。to 154.20(7)。. 

As shown in Table 3,the coordinating water, 

cayboxylate oxygen atoms of 4-EBA ligands and 

carboxylic H atom of 4-EBAH ligand are involved in 

7 

9 

7 

8 

3 

7 

7 

8 

2 

2 

8 

3 

3 

8 

1 0 

8 

8 8 

8 

4 5 

8 

O 2 

7 

5 

7 

0 2 

8 

7 9 

8 

O-H…O hydrogen-bonding interactions r09-H9B… 

Fig.3 Intramolecular hydrogen bonds of extended 

chain—like stuctrure along the b axis 

02,04-H4A…05).Furthermore,these hydrogen 

Table 2 Selected bond lengths(nn1)and angles(。)for the complex 

La1—07 

0.244 7(2) 

0.245 2(2) 

Lal—O8 

La1.05 

0.247 9(21 

Lal一09 

La1.03 

La1.06 

0.262 4(2) 

0.267 2(2) 

0.298 9(2) 

Lal—O1 

Lal一02 

0.258 1(2) 

0.246 6(2) 

0.245 7(2) 

Lal—O6 

O7i-Lal—O1 

O7 .La1.02 

85.28(8) 

138.38(8) 

88.76(7) 

72.12(8) 

06 .La1.O8 

O7i-Lal一05 

01.La1.05 

O2ii_La1.05 

06’.La1.O9 

08.La1。O9 

O5.La1一O9 

O7 一Lal一03 

75.51(8) 

65.78(8) 

141.11(8) 

70.76(8) 

67.79(8) 

O1.La1.02 

O7l-La1.O6 

0l-La】.O6 

O2 一La1 06— 

07LLa1.O8 

O1.I丑1—08 

88.38(8) 

148.91(8) 

O6 一La1。O5 

O1.Lal—O3 

O8.Lal一05 

OT-Lal—O9 

O1.Im1一O9 

02ii_Lal一09 

O8一La1.06 

05.La1.O6 

O9.La1一O6 

O2ii—La1.03 

O6j-Lal一03 

08一Lal一03 

05.La1.03 

68.89(8) 

137.01(8) 

142.87(8) 

69.82(7) 

129.47(8) 

134.89(8) 

81.26(8) 

122.91(7) 

69.86(7) 

O2ii.La1—08 

O9一La1—03 

07 一La1—06 

O6i.La1.06 

02 .La1.06 

O3一Lal一06 

77.73(7) 

1 14.27(7) 

108.39(7) 

O1.La1.O6 

154.20(7) 

Symmetry codes used to generate equivalent atoms: 1-x,-y,l-z; 2 ,一Y,1-z 

Table 3 Hydrogen bond lengths and angles 

第9期 杨娟等:一维链状4-乙基苯甲酸镧配合物[La(EBA)3(EBAH)(H 0)] 的合成、晶体结构和性质研究 

nm,0=0.233。,in which Cg is the ring centroid,dc.c is 

the centroid-centroid distance,dp P is the vertical 

distance,and 0 is the dihedral angle of two neighboring 

C2-C4-C6,C1 1一C13-C15,C20-C22-C24 and C29-C31一 

C33,respectively.Therefore,there is no obvious 7r…7r 

packing effect within the one—dimensional polymer 

although the benzene rings parallel highly each other. 

To some extent,the structure of the title complex 

7r—planes【l8】.Similarly,the benzene ring(C20,C2 1, 

C22,C23,C24,C25)and the neighboring B ring are 

also parallel highly with dc ̄c=0.394 1 2 nm,dP_P=0.356 02 

nm.0:O。.The weak 7『…7r stacking interactions 

is similar to that of complex[Eu(2・IBA)3・H20] (2-IBA= 

2-iodobenzoate) .The latter complex is also 1 D polymer 

chain structure,in which Eu ions are connected 

through two carboxyl groups of two 2・IBA ligands via 

the bridging--chelating・-bridging tetradentate coordina・・ 

tion mode.In the structure of 1 D chain polymer 

[Eu(2,4-DC1BA)3・(CH3CH2OH)2] (2,4-DC1BA=2,4一 

dichlorobenzoate)t .each Eu ion is eight.coordinated 

with four oxygen atoms of four bidentate--bridging 2,4-- 

DC1BA anions,two oxygen atoms of one bidentate— 

chelating 2,4一DC1BA anion and two atoms of two 

ethanol molecules.Unlike the title complex,in the 1 D 

polymeric chain of[Tb(3-IBA)3(H20)2・0.5(4,4 bipy)] 

(3-IBA=3一iodobenzoate;4,4 一bipy=4,4 bipyridine), 

each Tb ion is connected through four bidentate 

bridging 3-IBA ligands and lies in a distorted square- 

antiprism geometry.The 4,4 一bipy molecule in the 

crystal lattice does not coordinate to Tb ion【垌.In the 

dinuclear complex of{La[o—C6H4(NO2)(CO2)]3・(DMF)2}2 

o-nitro-benzoic acid),two La㈣ions are bridged by 

four 0一nitro-benzoic acid ligands with their carboxyls 

and occupy the nine coordination sites,in which two 

carboxyl groups adopt bidentate—bridging coordination 

mode and the other two take monodentate—bridging 

mode【l7】.Obviously.the distinct difference from the ifnal 

sturctures of these coordination complexes may be 

caused by the different ligands,for example,the 

different substituent groups or the different position 

locating in the benzene rings. 

In addition,each unit cell is packed by six 1 D 

polymeric chains along a axis.These 1D chains parallel 

each other with the shortest distance between the 

adjacent La of 1.474 63(6)nm and 1.498 47(6)nm. 

Moreover,there are two kinds of inter.molecular 7r…7r 

interactions between the benzene rings of neighboring 

polymeric chains.As shown in Fig.4,the benzene ring 

(C1 1,C12,C13,C14,C15,C16)and the adjacent A 

irng are parallel with dc-c=0.377 35 nm,dp

p=O.306 32 

assemble the neighboring 1D chains into the two— 

dimensional layer structure paralleling to bc plane for 

the title complex. 

Fig.4 Arrangement of the仃…仃stacking interactions 

paralleling to bc plane of the title compound 

2.2 IR and UV spectrum of the title complex 

The IR specturm of the complex was determined in 

the range of 4 000-400 cm—as KBr pellets.Compared 

with the 4一EBAH ligand,the IR spectral intensity of the 

complex around l 7 10 cm~is significantly weakened, 

which is observed for the—COOH【捌.It demonstrates 

that there are several different coordinating fashions of 

the carboxylate groups in the complex,including the 

deprotonated anions and the neutral molecule.Another 

feature of the IR data of the complexes iS the separation 

between v ̄(COO)and vs(coo-),which have often been 

used to discuss the coordination mode of carboxylate 

group in the carboxylate complexes.Two strong 

peaks at 1 532 and l 383 em一 could be assigned to the 

(C00一)and/Ys(coo一)stretching vibration of carboxyl 

1610 无机化学学报 第26卷 

in 4-EBA ligand.The Av[v (COO一)-v (COO一)]of 149 

am一 suggests that the coordination of the carboxylate 

groups is most probably of the bridging type ,which is 

also supported by the results from single-・crystal X・-ray 

diffraction data.Peaks observed at 2 985~2 846 cm-1 

are in good agreement with C-H vibrations.and the 

wide absorption peak at about 3 405 cm一 is assigned to 

the vibrations of water molecules.The weak band at 

435 am—may be assigned to the vibrations of La—O 

bond{2tJ. 

The UV spectra of the free ligand and the complex 

were recorded in DMF solvent with the concentration of 

1 mmol・IJ_ .Both of the spectra have one strong absorp— 

tion peak at 272 nm attributing to 7r 7r transition. 

however,the intensities are different.The absorption 

intensity of the complex =1.51 xl0。)is evidently 

stronger than that of free 4-EBAH ligand(e=0.72x 103), 

which is attributed to the coordination between the 

ligands and the center La3 ions.Owing to the formation 

of complex,the degree of conjugation and intensities of 

UV absorption obviously increased. 

2.3 Luminescent properties 

The solid state fluorescence spectrum of the 

complex was measured at room temperature.The 

excitation specturm was recorded in the range of 250- 

400 am,setting 449 nm as the emission wavelength,in 

which there is a strong peak at 335 nm.In contrast to 

the weak luminescence of the free ligand,the complex 

exhibits one strong band centered at 449 nm excited at 

335 nm in the solid state(Fig.5).Since there are no 4f 

electrons and the energy level of excited states below 

the tirplet levels of the ligand for La㈣ions the energy 

Wavelength/ilm 

Fig.5 Excitation(a)and emission(b)spectra of the 

complex in the solid state 

absorbed by the 4-EBA ligand cannot transfer to La㈣ 

ions.The absorbed energy can only relax through its 

own eneryg levels.The intense blue fluorescence 

emission of the complex is attributed to the enhanced 

7r electron transition of the ligand.Therefore.the 

complex emits the ligand.centered lfuorescence. 

2.4 Thermogravimetric analysis 

The TG—DSC analysis was performed in air 

atmosphere with a heating rate of 10 oC・min in tlle 

temperature range from 30 to 700℃.The results indic. 

ate that the complex involve two steps of weight losses. 

The first weight loss of 2.26%from 30 to 246℃ 

corresponds to the coordinated water molecule fcalcul— 

ated 2.39%1.The next mass reduction of 74.79%occurs 

in the range 246-625 oC and shows two apparent 

exothermie peaks,corresponding to the removal of 

organic ligands.The weight of the residue is 22.95%. 

Supposing La203 as final residue,calculated residue 

weight of the complex is 21.59%,which is in coincide- 

nce with experimental value.Results indicate that the 

complex is degraded to oxide,completely. 

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