Radiation-induced reduction of vanadium(IV) to vanadium(II) in aqueous picolinate-formate solutions期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Radiation-induced reduction of vanadium(IV) to vanadium(II) in aqueous picolinate-formate solutions

Institution:	1. Department of Pharmaceutical Analysis, ISF College of Pharmacy, Moga 142001, Punjab, India;2. Department of Pharmaceutics, ISF College of Pharmacy, Moga 142001, Punjab, India;1. Department of Chemistry, College of Science, University of Tikrit, Tikrit, Iraq;2. Department of Chemistry, College of Pharmacy, Hawler University of Medicine, Erbil, Iraq;3. Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, Kurt-Mothes-Str. 2, D-06120 Halle, Germany;4. Department of Biochemistry, Ege University, Faculty of Science, 35100 Bornova, Izmir, Turkey;5. Department of Chemistry, Faculty of Science, Dokuz Eylul University, 35160 Buca-Tinaztepe, Izmir, Turkey;6. Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK;7. Department of Chemistry, King''s College London, Britannia House, 7 Trinity Street, London SE1 1DB, UK

Abstract:	Quantitative reduction of V(IV)(pic) to V(III)(pic)_n and then to V(II)(pic)_n(1 ⩽ n ⩽3) occurs when N₂O-saturated formate solutions (pH 4.2–6.3) containing V(IV) and picolinic acid (2-carboxypyridine) are irradiated. Pulse radiolysis measurements show that CO^-₂ reacts with picolinate only when the N-atom is protonated (k = 2.7 × 10⁸ dm³ mol^-1 s^-1). Reduction of V(IV)(pic) and V(III)(pic)_n is effected by the electron adduct of the protonated picolinate (picH)^. with rate constants at pH 4.2 of (3.5 ± 0.2) × 10⁷ dm³ mol^-1 s^-1 for V(IV)(pic) and (6.9 ± 0.4) × 10⁸ dm³ mol^-1 s^-1 for V(III)(pic)_n. No reduction of V(II)(pic)_n is observed.

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