Synthesis, Structure, and Proton Conductivities of a Mg(II)‐based Coordination Polymer Composed of an Exotic Oxidized Ligand.

A Mg(II)‐based coordination polymer was synthesized by a solvothermal reaction between Mg2+ and 2,5‐dimercaptoterephthalic acid (H4dmtp) in N,N‐diethylformamide (DEF). The thiol (─SH) groups in the H4dmtp ligand were oxidized to form the sulfinato (─SO2−) groups, which were structurally stabilized through coordination to the Mg2+ centers. The temperature‐dependent proton conductivities exhibited relatively low activation energy (0.19 eV) for proton transfer, suggesting that the hydrogen‐bonded networks formed by the water molecules and the sulfinato oxygen atoms produced efficient proton‐hopping pathways. [ABSTRACT FROM AUTHOR]