Synthesis,Crystal Structure and Luminescent Properties of a Nd(Ⅲ) Complex Constructed from 2-Pyridyl-4,5-imidazoledicarboxylic Acid

A new Nd(Ⅲ) coordination polymer [Nd(pidc)(H2O)4]·pidc-·7H2O(1,pidc2-= 2-py-ridyl-4,5-imidazoledicarboxylate) has been synthesized by solvothermal reaction at 120 ℃ and structurally characterized.The complex belongs to triclinic,space group P with a = 9.022(2),b = 13.731(3),c = 13.782(3) ,α = 70.87(3),β = 71.71(3),γ = 71.71(3),V = 1488.6(7) 3,Z = 2,Dc = 1.798 g/cm3,S = 1.04,μ = 1.839 mm-1,F(000) = 814,Mr = 805.76,Rint = 0.081 and wR = 0.1644 for 5242 observed reflections(I > 2(I)).Each Nd3+ ion is nine-coordinated by five O atoms from three pidc ligands,and four O atoms from lattice water molecules.Each pidc is coordinated to three Nd3+ ions with a μ3-κO:κO’:κO",κO’"-μ2 coordination mode into 1D chains,which can be further built into a 3D framework through intermolecular N-H···O and O-H···O hydrogen bonds.Photolu-minescent studies have shown that 1 exhibits emission at 439 nm(λex = 395 nm).