One-step mild hydrothermal method to prepare low valent sodium vanadium(III) monohydrogenphosphate: NaV(HPO4)2

Novel reduced sodium vanadium(III) monohydrogenphosphate, NaV(HPO4)2, was grown using a one step mild hydrothermal method. In situ reduction of V5+ to V3+ was achieved using Cu(CH3COO)2. The 3D structure consists of distorted VO6 octahedra, PO3OH tetrahedra, and Na cations. Compound exhibits simple paramagnetism at high temperatures and a discontinuity at 5 K suggests magnetic coupling.242