Synthesis, Crystal Structure and Luminescence of a New Europium(Ⅲ) Coordination Polymer with Imidazole Carboxylic Ligand

摘要

A new luminescent compound,{[Eu3(L)4(H2O)8]·(NO3)·4H2O}n (1,H2L =2-(pyridine-3-yl)-imidazole-4,5-dicarboxylic acid) has been solvothermally synthesized and structurally characterized by elemental analyses,IR and single-crystal X-ray diffraction.1 crystallizes in monoclinic,space group C2/c with a =21.0183(19),b =9.5227(6),c =28.227(3) (A),β =106.885(5)°,V=5406.1(8) (A)3,Dc =2.038 g/cm3,μ =3.358 mm-1,Mr =1658.76,F(000) =3247,Z =4,the final R =0.0488,wR =0.1195 and S =1.075.The deprotonated L ligand employs a μ4-bridge to coordinate with three Eu(Ⅲ) ion,forming a wave-like (3,4)-connected 2D structure.The existence of π…π interaction between the pyridine rings of L ligands leads to an infinite 3D network.Furthermore,the thermal analysis,powder diffraction and solid-state photoluminescent properties of compound 1 have also been investigated.