Purely inorganic frameworks based on polyoxometalate clusters with abundant phosphate groups: single-crystal to single-crystal structural transformation and remarkable proton conduction

Abstract

A pure-inorganic framework based on {P₄Mo^V₄Mo^VI₂} clusters with rich phosphate groups has been synthesized. It underwent a single crystal to single crystal conversion in air to form a new framework with changes both in the metal valent state and coordination environment. The new framework exhibits an ultra-high proton conductivity of 1.33 × 10⁻² S cm⁻¹ at 95 °C and 98% relative humidity and excellent stability.