High Proton‐Conductivity in Covalently Linked Polyoxometalate‐Organoboronic Acid‐Polymers

The controlled bottom-up design of polymers with metal oxide backbones is a grand challenge in materials design, as it could give unique control over the resulting chemical properties. Herein, we report 1D-organo-functionalized polyoxometalate polymer featuring purely inorganic backbone. self-assembled from two types monomers, Wells–Dawson-type polyoxometalates, and aromatic organo-boronates. Their covalent linkage results 1D strands, which combine an backbone (based on B−O Nb−O linkages) functional organic side-chains. shows high bulk proton conductivity up to 1.59×10−1 S cm−1 at 90 °C 98 % relative humidity. This synthetic approach lead new class organic–inorganic where function can be designed by tuning monomer units.