Unusually high oxidation states of transition metals in anhydrous phosphates (B07)

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In the first part of project B7, targeting high oxidation states of the transition metals, NASICON type phosphates Na3Cr2(PO4)3, NaCrMV(PO4)3, NaMnIIIMV(PO4)3, and NaFeIIIMV(PO4)3 (M: Nb, Ta) will be syn-thesized and characterized with respect to their de-intercalation behavior. Oxidative coupling of phos-phate anions in Ag3CrIII(PO4)2, Ag3CrIII3(PO4)4, and Ag9CrIII3(P2O7)3(PO4)2 to "AgCrIIIP2O7", "Ag2CrIII6(P2O7)2(PO4)4", and "AgCrIII3(PO3)6(P2O7)" will be studied. In the second part of project B7 the kinetically controlled reduction of metalyl groups (M=O)n+ in solids phosphates (alphaII-VVOPO4, (Mo-VIO2)2P2O7, WVI2O3(PO4)2, WVIOP2O7) and its significance for C-H activation will be investigated besides redox equilibria in systems VVOPO4-MoVOPO4 and WVOPO4-MoVOPO4.