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.

Graphical Abstract

Keywords:

• Crystal structure
• proton conduction
• diphenylsulfone-3,3′-disulfo-4,4′-dicarboxylate
• coordination polymer

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

Authors thank the National Natural Science Foundation of China [grant nos. 21661014 and 21861020] and the Jiangxi Provincial Natural Science Foundation [grant nos. 20171ACB20008, 20202BAB203002, and 20181BAB203001] for financial support.