Two coordination polymers constructed from diphenylsulfone-3,3′-disulfo-4,4′-dicarboxylate ligand: syntheses, structures, and proton conduction

Abstract

Two coordination polymers, [Co2(DPSDSDC)(H2O)6] n (1) and {[Cu4(DPSDSDC)2(bpy)4(H2O)2]·11.5(H2O)} n (2) (H4-DPSDSDC =diphenylsulfone-3,3′disulfo-4,4′-dicarboxylic acid and bpy = 4,4'-bipyridine), were prepared and characterized. Compound 1 shows a two-dimensional (2-D) layered structure featuring hydrophilic interlayered spaces and a moderate proton conductivity of 5.22 × 10−5 S cm−1 at 95% RH and 85 °C. Compound 2 contains the linear trinuclear Cu3 units and mononuclear copper(II) units, which are connected by diphenylsulfone-3,3′-disulfo-4,4′-dicarboxylate and 4,4'-bipyridine ligands to afford a 3-D framework. Compound 2 exhibits low proton conductivity resulting from the hydrophobic aromatic rings on the pore walls.