Syntheses, Structures, and Photoluminescence of Three Coordination Polymers of Cadmium Dicarboxylates

Abstract

Solvothermal reactions of 2,2'-dihydroxy-[1,1']-binaphthalene-3,3'-dicarboxylate (H4bna), 4,4'-bipyridine (bpy), and Cd2+ salts at different conditions yielded three new one- to three-dimensional coordination polymers, ∞1[Cd(H2bna)(bpy)1.5(H2O)2] (1), ∞3[Cd6(MeCO2)4(bpy)2(H2bna)4]·3.5H2O (2), and ∞2[Cd6(bna)(H2bna)(bpy)(C2H5OH)] (3). Crystal structural analyses revealed that 1 is an unusual bpy-bridged ladder structure with carboxylate-end coordinated H2bna ligands as lateral arms, 2 is a three-dimensional α-Po network structure comprised of new hexanuclear [Cd6(μ-MeCO2)2(μ3-MeCO2)2]8+ clusters as the nodes and multiple H2bna and bpy as the linkers, whereas 3 exhibits a layer structure featuring bna-, H2bna-, and bpy-bridged infinite Cd−O ribbons. These compounds also displayed structure-related photoluminescence properties in the solid state.