Abstract
The green crystalline, homoleptic vanadium(IV) alkoxide [V 2(μ-OPr i ) 2(OPr i ) 6] ( I) has been reproducibly prepared in more than 60% yield; its identity was confirmed by chemical and physical methods including single-crystal X-ray diffractometry. Complex I is thermochromic in solution, changing reversibly from royal blue to gold yellow when cooled from 300 to 210 K. The assignment of this thermochromic behaviour to a mononuclear ( S = 1 2 ) ↔ binuclear ( S = 1) solution equilibrium is discussed. Complex I is a potential precursor of industrially-relevant vanadium-(IV), -(V) and mixed-valence vanadium oxides.
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