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）.
