Coordination chemistry of the tetrametalate core, {M4O16}: syntheses from [V2O2Cl2{(OCH2)2C(R)(CH2OH)}2] and structures of the mixed-metal cluster [V2Mo2O8(OMe)2{(OCH2)3CR}2]2– and the reduced cluster [V4O4(H2O)2(SO4)2{(OCH2)3CR}2]2–

Abstract

The reactions of [Ph₃PCH₂Ph][VO₂Cl₂] with (HOCH₂)₃CR yield binuclear species of the type [V₂O₂Cl₂{(OCH₂)₂C(R)(CH₂OH)}₂], which react in turn with [Buⁿ₄N]₂[Mo₂O₇] to give the mixed-metal tetrametalates, [V₂Mo₂O₈(OMe)₂{(OCH₂)₃CR}₂]^2– and with [Buⁿ₄N]HSC₄ and [Buⁿ₄N]₃[H₃V₁₀O₂₈] to yield the reduced tetravanadium clusters [V₄O₄(H₂O)₂(SO₄)₂{(OCH₂)₃CR}₂]^2–.