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  • 1 Szeged University Biocoordination Chemistry Research Group of the Hungarian Academy of Sciences, Department of Inorganic and Analytical Chemistry H-6701 Szeged P.O. Box 440 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 della Scienze Palermo Italy
  • 4 Fukuoka University Department of Chemistry, Faculty of Science Nanakuma, Jonan-ku, Fukuoka 814-01 Japan
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Abstract  

The complexes of six organic carboxylic acids (containing {O,O} donor atoms) with Bu2Sn(IV)2+ and Ph3Sn(IV)+ with ligand to metal ratios of 1 : 1 and 1 : 2, were prepared by two different methods. The FtIR and Raman spectra clearly demonstrated that the organotin(IV) moieties react with the {O,O} atoms of the ligands. It was found that in most cases the -COO-group was chelated to the central metal ions, but monodentate coordination was also sometimes observed. Complex formation was accompanied by a rearrangement of the hydrogen-bonding network existing in the ligands. The complexes probably have polymeric structures. Comparison of the experimental Mössbauer D values with those calculated on the basis of the point charge model formalism revealed that the organotin(IV) moiety has a trigonal-bipyramidal (tbp) geometry, and in certain cases a tetrahedral (tetr) geometry too. Finally, the local structure of the maleic acid complex formed with Bu2Sn(IV)2+ was determined by an EXAFS method.