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Short Communication: [CA1]Speciation in the vanadate–alanylhistidine–peroxide system
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
2000 (English)In: Journal of Inorganic Biochemistry, Vol. 80, no 1-2, 149-151 p.Article in journal (Refereed) Published
Abstract [en]

The speciation in the quaternary aqueous H+–H2VO4−–H2O2–-α-alanyl--histidine (Ah) system has been determined from quantitative 51V NMR measurements and potentiometric data (glass electrode). The study was performed in 0.150 M Na(Cl) medium at 25 °C. Data were evaluated with the computer program LAKE, which is able to treat combined potentiometric and NMR data. In the ternary H+–H2VO4−–Ah system, two complexes, (H+)p(H2VO4−)q(Ah)r, having (p, q, r) values (0, 1, 1) and (1, 1, 1) (pKa=6.88) explain all data. In the quaternary H+–H2VO4−–H2O2–Ah system, seven complexes were determined in addition to all binary and ternary complexes, four with a V/X/Ah ratio 1:1:1 and three with a ratio 1:2:1 (X=peroxo ligand). VX2Ah2− and VX2Ah− (pKa=8.26) are the main quaternary complexes and predominate in the pH range 5 to 9. Chemical shifts, compositions and formation constants for all the quaternary complexes are given, and equilibrium conditions are illustrated in distribution diagrams.

Place, publisher, year, edition, pages
2000. Vol. 80, no 1-2, 149-151 p.
Keyword [en]
Vanadium; 51V NMR; Dipeptide complexes; Peroxovanadium complexes
Identifiers
URN: urn:nbn:se:umu:diva-8967DOI: doi:10.1016/S0162-0134(00)00023-4OAI: oai:DiVA.org:umu-8967DiVA: diva2:148638
Available from: 2008-02-25 Created: 2008-02-25 Last updated: 2011-01-14Bibliographically approved

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CiteExportLink to record
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