Inhibitory effects of two monosubstituted decavanadates by Pt in monoplatino(IV)nonavanadate(V) ([HPtVO], VPt), and by Mo in monomolybdo(VI)nonavanadate(V) ([MoVO],VMo) were investigated against the growth of Mycobacterium smegmatis with the EC values of 0.0048 mM and 0.015 mM, respectively. These compare to the reported inhibitory value for decavanadate ([VO]/[HVO], V) on Mycobacterium smegmatis (EC = 0.0037 mM). Time-dependent V NMR spectroscopic studies were carried out for all three polyanions in aqueous solution, biological medium (7H9), heated and non-heated supernatant to evaluate their stability in their respective media, monitor their hydrolysis to form various oxovanadates over time and calculate the EC values. These studies allow us to calculate adjusted and maximum EC for the polyoxovanadate (POV) present in solution at the beginning of the study when there is most intact anion in the media and thus the EC values represent the initial effects of the POVs. The results have shown that V is 1.3 times more potent than VPt and 4 times more potent than VMo, indicating that the inhibitory effects of monosubstituted polyanions are related to the V structure. We attributed the minor differences in the growth inhibitory effects to the differences in charges (5- vs 6-) of VPt and VMo compared to V and/or the differences in the chemical composition. We concluded that the potency of the growth inhibition by V is mainly due to the chemical properties of the vanadium and the decametalate's unique structure even though the presence of the Mycobacterium smegmatis facilitate hydrolysis of the anions. SYNOPSIS: Two decavanadate derivatives, monoplatino(IV)nonavanadate(V) ([HPtVO]), monomolybdo(VI)nonavanadate(V) ([MoVO]) and decavanadate are more potent growth inhibitors of Mycobacterium smegmatis than monomeric vanadate. The spectroscopic characterization carried out in the growth medium led to the conclusion that both the decavanadate structure and its properties are important for its growth effects.
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