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

摘要

Three new transition metal-organic coordination polymers [Zn(bpp)(C _4H_4O_4)]·1.2H_2O 1, [Cd(bpp)_2(H_2O)_2](C_4O _4)·8H_2O _2 and [Cd(bpp)_2(C _4O_4)]·H_2O _3 have been synthesized from the reaction of d10 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 CdN_4O_2 octahedras in 2 are bridged by a pair of bpp ligands to form 1D repeated rhomboid chains, which are assembled into 2D layer via the hydrogen bonds. The six-coordinated Cd~(2+) 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.