Synthetic pathways to vanadyl organophosphonates through aqueous media

Synthesis of vanadyl(IV) organophosphonates VORPO3 · nH2O (with R = CH3, C2H5, C6H5) has been investigated by reaction of VOSO4 · 5H2O + RPO3H2 under refluxing conditions in aqueous media. The influence of different parameters is discussed, and compounds are characterized by X-ray powder diffraction, TGA, IR, XANES, and EXAFS. For example, three crystallographic forms of VOC6H5PO3 · 2H2O obtained differ from each other in the location of the trans water molecule in the layered structure.