A peroxochromium complex, TpiPr2Cr(O2)2, obtained by oxidative dehydrative condensation between a dihydroxochromium complex and H2O2 [TpiPr2 = hydrotris(3,5-diisopropylpyrazolyl)borato]

Abstract

Synthesis of a peroxochromium complex containing the Tp^iPr₂ [hydrotris(3,5-diisopropylpyrazolyl)borato] ligand has been attempted by (i) dehydrative condensation between hydroxochromium complexes and H₂O₂ and (ii) oxidative addition to a Cr(II) species. As a result, a diperoxochromium(V) complex, Tp^iPr₂Cr(O₂)₂, is obtained by oxidative dehydrative condensation of the dimeric (dihydroxo)(aquo)chromium(III) complex, [Tp^iPr₂Cr(OH)₂(OH₂)]₂, with H₂O₂, whereas O₂-oxidative addition to Cr(II) species affords Cr(III) species or dinuclear Tp^iPr₂Cr species bridged by chromate (CrO₄) or dichromate ions (Cr₂O₇). The preparations of the starting complexes and oxidation reactions by the diperoxo complex are also described.