Synthetic pathways to new hydrated sodium and lithium vanadium bronzes

Synthesis of new hydrated sodium vanadium and lithium vanadium bronzes has been investigated by reaction of VOSO4. 5H(2)O, VO(C5H7O2)(2), or V2O3 with compounds containing C-O bonds (such as acetates) and NaOH or LiOH solutio ns under refluxing conditions in aqueous media. These layered compounds are characterized by X-ray powder diffraction, IR, and TGA, Thermal treatment for temperatures higher than 310 and 450 degrees C for sodium vanadium bron zes and lithium vanadium bronzes, respectively, leads to well-known anhydro us bronzes Na0.33V2O5 and Li0.22V2O5. (C) 2000 Academic Press.