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- W2045786411 abstract "The interaction between oxovanadium(IV) and primary hydroxamic acids (aceto- (HAha), benzohydroxamic acid (HBha) or N-hydroxy-N′-[3-(N-hydroxy-carbamoyl)-propyl]-heptane-1,7-dicarboxamide (H2Diha)) as well as the corresponding N-methyl substituted hydroxamic acids (HMeAha, HMeBha, H2MeDiha) was studied by pH-potentiometric and pH-stat methods in aqueous solution. Stoichiometry and stability constants of the VO(IV) complexes formed in the pH range 2.0–5.0 were determined and the effect of the substituents on the C or N atoms of the hydroxamic group is discussed. The dihydroxamic acids are more effective oxovanadium(IV) binders than the monohydroxamic ones. Above pH = 4.5–5.0 (depending upon ligand excess), slow redox reaction was found in all the systems studied. During this process, beside the oxidation of VO(IV) to the appropriate V(V)–hydroxamate complex, formation of amides as reduction products was detected under anaerobic conditions. The same reaction can also take place when stirring sparingly soluble VOA2 type complexes (A: Bha or MeBha) in water in the absence of oxygen. The exact stoichiometry of the redox reaction was determined by pH-stat measurements and found to be 2VO(R1CON(R2)O)2 + R1CON(R2)OH + H2O = 2[VO2(R1CON(R2)O)2]− + 2H+ + R1CON(R2)H (R1: CH3, C6H5; R2: H, CH3) for the monohydroxamates. The N-methyl hydroxamic acids tend to oxidise VO2+ significantly slower than the corresponding primary ones." @default.
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- W2045786411 date "2005-05-01" @default.
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- W2045786411 title "Study of the interaction between oxovanadium(IV) and hydroxamic acids" @default.
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- W2045786411 doi "https://doi.org/10.1016/j.poly.2005.03.007" @default.
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