A tetranuclear copper cluster-based MOF with sulfonate–carboxylate ligands exhibiting high proton conduction properties

A tetranuclear copper cluster-based MOF with sulfonate–carboxylate ligands has been synthesized. It possesses 1D irregular channels lined with sulfonate, carboxylate, and DMF molecules, which show a high proton conductivity of 7.4 × 10⁻⁴ S cm⁻¹ at 95 °C and 95% relative humidity.