Synthesis, structures and luminescence properties of three Mg(II)-Dy(III) heterometallic coordination polymers

Three new heterometallic coordination polymers [Dy-2(pydc)(6)Mg-3(H2O)(6)]center dot 11H(2)O (1), [Dy(pydc)(3)] [Mg(H2O)(6)]center dot Him center dot 7H(2)O (2), and [Dy(pydc)(3)(im)(2)Mg(H2O)(2)]center dot Him center dot 3H(2)O (3) (H(2)pydc = pyridine-2,6-dicarbolylic acid, im = imidazole) were solvothermally synthesized by reacting H(2)pydc, Dy(NO3)(3)center dot 6H(2)O, MgCl2 center dot 6H(2)O and imidazole at 393 K for 48 h. They were characterized by elemental analysis, IR, TG and XRD. The three compounds are different in structure. Coordination polymer 1 exhibits a three-dimensional network structure with topology symbol of {4(4).6(2)}(3){4(9).6(6)}(2). Complex 2 is a zero-dimensional ionic complex. Coordination polymer 3 displays a one-dimensional chain structure. The solid-state luminescence properties for 1-3 were determined. They all show characteristic emission spectra of Dy(III) ions. (C) 2020 Elsevier B.V. All rights reserved.