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Three new lanthanide coordination polymers [Ln(bppc)2(suc)0.5(H2O)]n·nH2O (Ln =Eu(l),Ln =Dy(2),Ln =Tb(3),Hbppc =2,6-bis(pyrazin-2-yl)pyridine-4-carboxylate,H2suc =succinic acid) have been hydrothermally synthesized and structurally characterized.These compounds are isostructural and crystallize in triclinic P(1) space group.The Ln([Ⅲ) ions are eight-coordinated with dodecahedral coordination geometry.Ln(Ⅲ) cations are linked by carboxylate groups from (bppc)-ligands to form one-dimensional ring chains,which are further connected by the carboxylate groups of (bppc)-and (suc)2-ligands to extend a 2D layer structure.These coordination polymers display the characteristic emission bands of Ln(Ⅲ) ions in the solid state.