Complexes of hydroxamates. Part 1. Interaction of methioninehydroxamic acid with iron(III) in aqueous solution |
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| Affiliation: | 1. Department of Chemistry, M. V. Lomonosov Moscow State University, 1 Leninskie Gory, 119992 Moscow, Russian Federation;2. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 119991 Moscow, Russian Federation;3. N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation;4. Inorganic Chemistry Department, Peoples'' Friendship University of Russia, 6 Miklukho-Maklaya St., 117198 Moscow, Russian Federation;1. Nanyang Technological University, School Civil & Environmental Engineering, 50 Nanyang Avenue, Singapore, 639798, Singapore;2. Nanyang Technological University, Nanyang Environmental & Water Research Institute, R3C, 1 Cleantech Loop, Singapore, 637141, Singapore;3. Nanyang Technological University, Energy Research Institute @NTU (ERI@N), SCARCE laboratory, 50 Nanyang Avenue, Singapore, 639798, Singapore;4. Department of Biomedical Science & Biofilms-Research Center for Biointerfaces, Malmo University, 205 06, Malmo, Sweden;1. Laboratoire de Physico-chimie des Matériaux, University of Monastir, Faculté des Sciences de Monastir, Avenue de l''environnement, 5019 Monastir, Tunisia;2. Centre de Diffractométrie X, Institut des Sciences Chimiques de Rennes, UMR 6226, CNRS-Université de Rennes, 1, Campus de Beaulieu, 35042 Rennes Cedex, France;3. ICSN Bât 27, 1 avenue de la Terrasse, 91190 Gif sur Yvette, France |
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| Abstract: | The binding affinity of Fe(III) to methioninehydroxamate (MX) has been studied spectrophotometrically at I=0.15 M NaCl and T=25 °C. Equilibrium data have been assessed by the program SQUAD(II) in the wavelength range 400–550 nm and in the pH range 1.5–5.0. Five formation constants were determined for the species Fe(MX)(H)3+, Fe(MX)2+, Fe(MX)2(H)23+, Fe(MX)2(H)2+ and Fe2(MX)33+. The stopped-flow kinetic data studied at 470 nm and in the pH range 1.0–3.0 is collectively expressed by the following rate equation at a given pH Rate=(A + BTMX)TMX where TMX=the analytical connection of MX and the parameters A and B are both functions of pH in the range 1.7–3.0, but only A in the range 1.2– 1.7. A proposed mechanism was discussed, based on the equilibrium study, where the role of the chloro species of Fe(OH)2+ and Fe(OH)2+ in the complex formation of Fe(III) with MX has been emphasized. Correlation of the results with pertinent systems has also been discussed. |
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