HYDROTHERMAL SYNTHESIS AND CHARACTERIZATION OF VANADYL ALKYLPHOSPHONATES VORPO3.H2O

A series of layered compounds of general composition VO(CnH2n+1PO3) . yH2O (y = 1.5, 1 less-than-or-equal-to n less-than-or-equal-to 3; y = 1.0, 4 less-than-or-equal-to n less-than-or-equal-to 8) has been synthesized by hydrothermal reaction of V2O3 and the corresponding alkylphosphonic acid in water at 200-degrees-C. The compounds with n less-than-or-equal-to 3 have structures similar to that of VO(HPO4) . 0.5H2O. The compositions with 4 less-than-or-equal-to n less-than-or-equal-to 8 also are layered, with structures apparently related to that of VO(C6H5PO3) . H2O. The phases with n greater-than-or-equal-to 4 have compositions and structures identical to those of the compounds prepared via water treatment of the benzyl alcohol intercalation compounds VO(CnH2n+1PO3) . H2O . C6H5CH2OH, which were reported previously.