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- W2109302644 abstract "Spectroscopic and electrochemical studies were carried out to characterize the vanadium(IV) and (V) complexes that form in solution and their interconversions. 51V NMR spectroscopy coupled with ¹H NMR, 13C NMR and EPR spectroscopy were used to characterize the vanadium(V)-tartrate complexes that form in the vanadium-tartrate system. The major complex that forms over most of the pH range is a 1:1 complex. In addition a minor 1:2 complex forms. The 1:2 complex formed from enantiomerically pure tartaric acid was less stable than complex formed from racemic tartaric acid. These complexes are different than the 2:2 complex that is the major contributor in the vanadium(IV)-tartrate system. The polarographic and cyclic voltammetic investigations of the electrochemical behavior of V(V) in the presence of tartrate demonstrated a complex formation. The diffusion coefficient values of free vanadium ions and vanadium-tartrate complexes were determined. The minimum average values for the diffusion coefficient for the vanadium(IV)-tartrate 2:2 complexes were determined to range from 3 <FONT FACE=Symbol>´</FONT> 10-6 cm² s-1 to 17 <FONT FACE=Symbol>´</FONT> 10-6 cm² s-1 depending on pH." @default.
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- W2109302644 date "2006-10-01" @default.
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- W2109302644 title "Spectrometric and electrochemical investigation of vanadium(V) and vanadium(IV) tartrate complexes in solution" @default.
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- W2109302644 doi "https://doi.org/10.1590/s0103-50532006000500012" @default.
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