Syntheses, structures, and photoluminescence of three coordination polymers of cadmium dicarboxylates

Solvothermal reactions of 2,2'-dihydroxy-[1,1']-binaphthalene-3,3'-dicarboxylate (H(4)bna), 4,4'-bipyridine (bpy), and Cd2+ salts at different conditions yielded three new one-to three-dimensional coordination polymers, (1)(infinity)[Cd(H(2)bna)(bpy)(1.5)(H2O)(2)] ( 1) (3)(infinity)[Cd-6(MeCO2)(4)( bpy)(2)(H(2)bna)(4)] center dot 3.5H(2)O ( 2), and (2)(infinity)[Cd-6(bna)(H(2)bna)(bpy)(C2H5OH)] ( 3). Crystal structural analyses revealed that 1 is an unusual bpy-bridged ladder structure with carboxylate-end coordinated H(2)bna ligands as lateral arms, 2 is a three-dimensional alpha-Po network structure comprised of new hexanuclear [Cd-6(mu-MeCO2)(2)(mu(3)-MeCO2)(2)](8+) clusters as the nodes and multiple H(2)bna and bpy as the linkers, whereas 3 exhibits a layer structure featuring bna-, H(2)bna-, and bpy-bridged infinite Cd-O ribbons. These compounds also displayed structure-related photoluminescence properties in the solid state.