Metal-organic coordination polymers based on dicarboxylate and a flexible bispyridyl ligand: Synthesis, structures, and photoluminescence

Three new transition metal-organic coordination polymers [Zn(bpp)(C4H4O4)]center dot 1.2H(2)O 1. [cd(bPO(2)(H2O)(2)](C4O4)center dot 8H(2)O 2 and [Cd(bpp)(2)(C4O4)]center dot H2O 3 have been synthesized from the reaction of d(10) block metal, dicarboxylic acid with 1,3-bis(4-pyridyl)-propane (bpp). Structural analysis reveal that the Zn atoms in 1 are bridged by the succinate anions to generate helical chains, which are interlinked by bpp ligands to a 3D framework with Sra (4(2) . 6(3) . 8) topology. The CdN4O2 octahedras in 2 are bridged by a pair of bpp ligands to form ID repeated rhomboid chains, which are assembled into 2D layer via the hydrogen bonds. The six-coordinated Cd2+ ions in 3 are bridged by the acetylenedicarboxylato ligand to form 1D zigzag chains, which are interconnected by bpp ligands to construct 3D metal-organic framework with a (4(8) . 6(7)) topology. The fluorescent spectra of 1-3 indicate intraligand fluorescence emission upon irradiation. (C) 2011 Elsevier B.V. All rights reserved.