Nuclear magnetic resonance studies of the coordination of vanadyl complexes in solution and the rate of elimination of coordinated water molecules

Abstract

17The temperature dependence of the 0 nmr linewidth in

Fifteen years of dancing with vanadium

“…Information on the ligand exchange of vanadium(IV) compounds has been obtained using a range of techniques [139][140][141]. Three types of oxygen ligands on the vanadium(IV) with different substitution rates have been identified [139,140].…”

Chalcogen chemistry. V. Complexes of organotellurium trihalides with tetramethylthiourea

“…studies9•44 of the nonenzymatic systems CHaCOCOO"-TPP and CH3COCOO "-thiamine have shown that pyruvate is decarboxylated and condensed to a-acetolactate, CH3COCOH(COO")CH3, without appreciable accumulation of the intermediate, a-hydroxyethylthiamine pyrophosphate. We can tentatively assign the resonance at 8.5 in Figure 3c (r 8.7 in Figure 3d) to the CFl3COH(COO"-)-methyl group and the resonance at 7.7 ( 7.8 in Figure 3d) to the CHaCOCOOm ethyl group and the CH3COCOH(COO~)methyl group.…”

Fifteen Years of Dancing with Vanadium

“…Three types of oxygen ligands on the vanadium(IV) with different substitution rates have been identified [139,140]. Although early studies provided data that suggested an associative mechanism may be in effect for these types of systems [118,142].…”