A Complex Based on a CuII–Schiff‐Base Complex and POM‐MOF Chain: Synthesis, Structure and Proton Conductivity

Abstract

AbstractA metal–Schiff‐base–POM‐MOF, {[Cu3(L)2(H2O)4] [Cu(dmf)4(SiW12O40)]·9H2O}n {L = N,N′‐bis[(2‐hydroxy‐3‐methoxyphenyl)methylidene]hydrazine hydrate}, has been synthesized in situ from [SiW12O40]4–, Cu2+ and L in an H2O/dmf/CH3OH/CH3CN mixture at room temperature, and the product was characterized by elemental analysis, IR spectroscopy and single‐crystal X‐ray diffraction analysis. X‐ray diffraction analysis revealed that the title complex presents a 3D network constructed from CuII–Schiff‐base cations, 1D POM‐MOF chains and solvent water molecules. Its water vapour adsorption isotherm at room temperature and pressure shows that the water vapour adsorbed by the complex is 51.67 cm3 g–1 at the maximum allowable humidity, which corresponds to 7.1 water molecules per unit formula. In addition, it exhibits good proton conductivity (>10–4 S cm–1) at 100 °C in the relative humidity range 35–98 %. The corresponding activation energy (Ea) of conductivity was estimated to be 0.32 eV.