NEW TRINUCLEAR, OXO-CENTERED, BASIC CARBOXYLATE COMPOUNDS OF TRANSITION METALS. 3. SYNTHESES AND X-RAY STUDIES OF THE TRIVANADIUM(III,III,III) AND TRIVANADIUM(II,III,III) COMPOUNDS (V3(μ3-O)(CH3CO2)6(CH3COOH)2(THF))+(VCL4(CH3COOH)2)-