Mixed crystals containing the dioxo complex [[Ph3SiO]2VO2]- and novel pentacoordinated oxoperoxo complex [[Ph3SiO]2VO(O2)]-: X-ray crystal structure and assessment as oxidation catalysts.

[n-Bu4N][[Ph3SiO]2VO2] reacts with H2O2 to yield an oxoperoxo complex which crystallizes as a mixed-crystal compound, [P(C6H5)4][[(C6H5)3 SiO]2VO2]x[[(C6H5)3 SiO]2VO(O2)](1-x), 1(x = 0.57). It has been characterized by elemental analysis and spectroscopy (51V NMR, UV-visible and IR).