The effect of ligand/ metal-ligand ratio on the structural architectures of five different 1D zinc(II) coordination polymers with pyridyl derivative ligands

Abstract

Five coordination compounds, [Zn(bppc)Cl]n·0.5nH2O (1) [Zn2(bppc)2(suc)]n (2), [Zn(dppb)Cl]n·nH2O (3) [Zn(dppb)Cl]n (4) [Zn2(dppb)2(bdc)]n·2nH2O(5) (Hbppc =2,6-bis(pyrazin-2-yl)pyridine-4-carboxylic acid, H2suc=succinic acid, Hdppb=4-(2,6-di(pyrazin-2-yl)pyridine-4-yl)-benzoic acid, H2bdc=1,4-benzenedicarboxylic acid), with the same one dimensions but different patterns have been hydrothermally synthesized and structurally characterized. Single crystal X-ray analysis revealed that compound 1 shows one-dimensional wave chain structure, compound 2 to 5 show one-dimensional ladder chain structure, one-dimensional V-shaped chain structure, one-dimensional linear chain structure and one-dimensional A-shaped chain structure, respectively. The structure differences of 1–5 show that ligand including auxiliary ligand and metal-ligand ratio have important influence on the final structures. Additionally, the luminescent properties of 1–5 have been investigated with fluorescent spectra in the solid state and fluorescence sensing experiments show that compound 1 exhibit a great selectivity and sensitivity for detection of Cu2+ion and nitrobenzene.