Three New Lanthanide Coordination Polymers Constructed from 2,6-Bis(pyrazin-2-yl)pyridine-4-carboxylate: Syntheses, Structures and Luminescence

Three new lanthanide coordination polymers [Ln(bppc)(2)(suc)(0.5)(H2O)](n)center dot nH(2)O (Ln = Eu(1), Ln = Dy(2), Ln = Tb(3), Hbppc = 2,6-bis(pyrazin-2-yl)pyridine-4-carboxylate, H(2)suc = succinic acid) have been hydrothermally synthesized and structurally characterized. These compounds are isostructural and crystallize in triclinic P (1) over bar 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.