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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/45307
Title: Coordination study of chitosan and Fe3+
Authors: Hernández, Raúl B.; Franco, Ana Paula; Yola, Oscar R.; López-Delgado, Aurora; Felcman, Judith; Recio, María Angeles; Mercê, Ana Lucía
Keywords: Chitosan
Issue Date: 2008
Publisher: Elsevier
Citation: Journal of Molecular Structure 877 (1-3) : 89-99 (2008)
Abstract: The coordination of Fe3+ with chitosan was studied, considering the type of acid for dissolving the ligand, the pH for the medium, and the metal-biopolymer ratio. Potentiometric and ultraviolet–visible titrations, infrared spectroscopy, thermal analysis and X-ray diffraction were employed. The polymer coordinates with the metal cation through the amino and hydroxyl groups in the entire pH range studied, with pH values around 3–6 being the most important region. The logarithms of the overall binding constants for the equilibria were: A: Chit–Fe, βA 16.06 ± 0.07; B: Chit2–FeH, βB 32.64 ± 0.07; C: Chit3–Fe, βC 35.6 ± 0.1; D: Chit3–FeH, βD 49.0 ± 0.2, respectively. The coordination is made either by the amino or/and the hydroxyl groups with water molecules or/and chloride ions completing the coordination sphere for the metal giving rise to among other possible, di- to hexacoordinated complexed species [FeNO2Cl3], [FeN2O2Cl2], [FeN3O3] and [FeN2O4].
Publisher version (URL): http://dx.doi.org/10.1016/j.molstruc.2007.07.024
URI: http://hdl.handle.net/10261/45307
ISSN: 0022-2860
DOI: 10.1016/j.molstruc.2007.07.024
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