Interactions between D-ribose or D-glucosamine and Cu(II) ion have been studied by electronic spectra, ESR, and Cu K-XANES and -EXAFS measurements. All data have shown that (1:1) Cu(II)-sugar complexes are formed in aqueous solution at high pH. The have ESR spectra of the two Cu(II)-sugar complexes indicated the presence of a dimeric species via hydroxide oxygen atoms in the solution. From the analysis of the EXAFS spectra the oxygen coordination geometry around Cu(II) ion and the Cu(II)-O bond lengths within the Cu(II)-sugar complexes are not very different from those of the hexaaqua Cu(II) ion. EXAFS Fourier transforms have clearly shown a peak ascribed to non-bonded Cu(II)...C interactions, indicating the formation of chelate rings of the sugar-ligand around the Cu(II) ion. The most likely structure of the Cu(II)-sugar complexes is proposed.
|Translated title of the contribution||Structure of Cu(II) complexes of D-ribose and D-glucosamine. Electronic, ESR and EXAFS studies|
|Number of pages||3|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - Dec 1 2000|
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