A Heterobimetallic Vanadium-Manganese Complex as a Model for the Structural Dynamics in Oxo-Bridged Metal Dimers.

The heterobimetallic complex 1, [LV(&mgr;-O)(&mgr;-OAc)(2)MnL] (where L = hydridotris(pyrazolyl)borate), has been synthesized and characterized. X-ray crystal structural analysis of 1 gave the following parameters: C(24)H(29)B(2)N(13)O(5)VMn, Cmc2(1), a = 13.364(2) Å, b = 17.383(3) Å, c = 14.132(3) Å, Z = 4, V = 3289.9(16) Å(3). An analysis of the structure, optical and resonance Raman spectroscopies, and magnetic measurements indicates that a V(IV)=O.Mn(II) valence formulation is the best description of the oxo-bridged core in 1, although other resonance forms must also contribute.