Metal and bis(pyridyl)-bis(amide) ligands – tuned three new nickel(II)/copper(II) coordination polymers: Syntheses, structures and properties

Abstract

Three new Ni(II)/Cu(II) coordination polymers (CPs), [Ni(L1)1.5(HBTC)(H2O)] (1), [Ni(L2)2(HBTC)]·2H2O (2) and [Cu2(L2)0.5(BTC)(μ3-OH)]·2H2O (3) {H3BTC = benzene-1,3,5-tricarboxylic acid, L1 = (E)-4,4′-(ethene-1,2-diyl)bis[N-(pyridin-3-yl)benzamide] and L2 = (E)-4,4′-(diazene-1,2-diyl)bis[N-(pyridin-3-yl)benzamide]}, were prepared under hydrothermal and solvothermal conditions by regulating different metals and ligands. The structures of CPs 1–3 were characterized by single crystal X-ray diffraction analyses, infrared spectroscopy (IR) and powder X-ray diffraction (PXRD). CP1 displays a 4-connected 3D topological structure based on [Ni(HBTC)]n chains and [Ni(L1)1.5]n chains. When L2 was used, CP2 demonstrates a 1D chain structure. CP3 is a 3D metal–organic network with the binodal (3,8)-connected {4·62}2{42·622·7·83} topology constructed from {Cu4} clusters and L2 ligands. The photocatalytic properties and electrochemical behaviors of CPs 1–3 were explored. The effect of solvent on the formation of the title CPs as well as the influence of the central metals and ligands on the structures and properties are discussed.