Copper(II) complexation by D-glucosamine. Spectroscopic and potentiometric studies |
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| Authors: | G Micera S Deiana A Dessi&#x; P Decock B Dubois H Koz?owski |
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| Institution: | Istituto di Chimica Generale e Inorganica, Università di Sassari Via Vienna 2, 07100 Sassari, Italy;Istituto per l''Applicazione delle Tecniche Chimiche Avanzate ai Problemi Agrobiologici, C.N.R., Via Vienna 2, 07100 Sassari, Italy;Laboratoire de Chimie Minárale et Méthodologie Analytique, Université des Sciences et Techniques de Lille, 59655 Villeneuve d''Ascq Cedex, France;Institute of Chemistry, University of Wroc?aw, 14 F. Joliot-Curie Street, 50383 Wroc?aw, Poland |
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| Abstract: | The Cu(II) complex formation equilibria of D- glucosamine were studied in aqueous solution by potentiometric and spectroscopic (ESR, CD, absorption spectra) techniques. All data agree that two major species are formed in the pH region 6–9 involving two D-glucosamine ligand molecules bound to the cupric ion via NH2(CuL2) or NH2 and O? (CuH?2L2). In the latter case deprotonated hydroxyls were found to be very effective coordination sites for Cu(II) giving rise to chelate complexes. On the contrary, no complex formation was observed for the Cu(II) N-acetyl-D-glucosamine system. |
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| Keywords: | Author to whom correspondence should be addressed |
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