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  • 1 Szeged University Biocoordination Chemistry Research Group of the Hungarian Academy of Sciences, Department of Inorganic and Analytical Chemistry P.O. Box 440 H-6701 Szeged Hungary
  • 2 Szeged University Department of Inorganic and Analytical Chemistry H-6701 Szeged P.O. Box 440 Hungary
  • 3 University of Palermo, Parco d'Orleans Department of Inorganic Chemistry Viale delle Scienze 90128 Palermo Italy
  • 4 T. Shevchenko University Department of Chemistry Kiev Ukraine
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The complexes of four oxime analogues of amino acids and peptides (containing {O,N} donor atoms) with Bu2SnO were prepared, with ligand to metal ratios of 1 : 1 or 1 : 2, by two different methods. The FT-IR and Raman spectra clearly demonstrated that the organotin(IV) moieties react with the {O,N} atoms of the ligands. It was found that in most cases the -COO- group is coordinated to the central metal ion in a monodentate mode. Complex formation was accompanied by a rearrangement of the hydrogen-bonding network existing in the ligands. The complexes probably have monomeric structures. Comparison of the experimental Mössbauer values with those calculated on the basis of the point charge model (pqs) formalism revealed that the organotin(IV) moiety has octahedral (oct) geometry, and in certain cases trigonal-bipyramidal (tbp) geometry too.