Water-mediated proton conduction in Ni(ii) and Co(ii) benzenetriphosphonates

Abstract

Two novel transition metal compounds, [Ni(4,4′-bipyH)₂(H₂O)₄]·2(H₄bmt)·9H₂O (1) and [Co(4,4′-bipy)(H₂O)₄][Co(4,4′-bipyH)₂(H₂O)₄]·2(H₃bmt)·6H₂O (2), have been synthesized. They possess continuous H-bond networks and high-density [PO₃] groups, which give conductivity values in the order of 10⁻³ S cm⁻¹ in a wide temperature range and 98% relative humidity.