An extraordinary boron-mediated 16R-channel-containing trivalent vanadium phosphite with unique solid state redox properties.

For the first time, an open-framework oxysalt of trivalent vanadium is demonstrated, prepared from a single tetravalent vanadium source under acidic hydrothermal conditions. The borate-incorporated structure features intersecting 2D 16R channels and unusual solid-state redox properties confirmed by K-edge XANES, EPR spectral data and magnetic susceptibility measurements.