Metal-ion environment in solid Mn(II), Co(II) and Ni(II) hyaluronates |
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Authors: | Tratar Pirc Elizabeta Arcon Iztok Kodre Alojz Bukovec Peter |
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Institution: | Faculty of Chemistry and Chemical Technology, Askerceva 5, SI-1000 Ljubljana, Slovenia. tratar@uni-lj.si |
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Abstract: | Amorphous powders and films of some metal hyaluronate complexes of general composition (C14H20O11N)2 x xH2O (M = Mn2+, Ni2+ and Co2+) have been prepared at pH 5.5-6.0. The coordination geometry around the metal ions has been analyzed by EXAFS (extended X-ray absorption fine structure) and FTIR spectroscopy. Mn2+, Ni2+, and Co2+ ions are coordinated to carboxylate oxygen atoms and water molecules. The process of local geometry formation round the metal ions is sensitive to sample preparation. |
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Keywords: | Metal hyaluronate EXAFS FTIR Conformation |
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