Syntheses, crystal structures and photophysical properties of Ni/Co-Ln coordination polymers

Abstract

Fourteen isomorphic heterometallic coordination polymers (CPs) with general formulas of {[LnM(2,3-pydc)2(ox)0.5(H2O)3]·3H2O}n (M = Ni, Ln = Pr 1, Nd 2, Sm 3, Eu 4, Gd 5, Tb 6, Dy 7; M = Co, Ln = Pr 8, Nd 9, Sm 10, Eu 11, Gd 12, Tb 13, Dy 14; 2,3-pydc2– = fully deprotonated pyridine-2,3-dicarboxylic acid, ox2– = fully deprotonated oxalic acid) have been synthesized by hydrothermal methods. All the CPs crystallize in triclinic P-1 space group and exhibit a 3D network formed by 2,3-pydc2– and ox2– bridging Ln(III) and Ni(II)/Co(II) ions. Meamwhile the room temperature photoluminescent properties have been explored. Except for CPs 5 and 12, the other CPs exhibit characteristic luminescence of Ln(III) ions.