NMe4V3O7: critical role of pH in hydrothermal synthesis of vanadium oxides

pH is critical in the formation of new mixed-valence vanadium oxides, NMe 4 V 3 O 7 , NMe 4 V 4 O 10 and the dioxide Li x V 2 O 4 ·H 2 O, with NMe 4 + cations or water molecules residing between vanadium oxide layers.