6533b837fe1ef96bd12a2688

RESEARCH PRODUCT

Synthesis and spectral studies on metal complexes with the neutral O,N,O-tridentate Schiff base 6-amino-5-formyl-1,3-dimethyluracil-benzoylhydrazone

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Abstract From the reaction between different Co(II), Cu(II), Zn(II) and Pd(II) salts and the Schiff base 6-amino-5-formyl-1,3-dimethyluracil-benzoylhydrazone (H 2 BEZDO), in ethanol and acetone media, five complexes with M/L stoichiometry 1/1, containing the neutral organic ligand, have been obtained. These compounds have been studied by IR, 13 C and 1 H-NMR, UV-VIS-NIR and EPR spectroscopies and magnetic measurements. A single crystal X-ray diffraction study has been carried out on the compound [Cu(ClO 4 )(H 2 BEZDO)(H 2 O)]ClO 4 . The structure consists of mononuclear cations [Cu(ClO 4 )(H 2 BEZDO)(H 2 O)] + and uncoordinated perchlorate anions. The coordination environment around the Cu(II) may be described as a square-based pyramid in which the Schiff base acts as tridentate ligand through the O(4), N(51) and O(52) atoms, making two five- and six-membered chelate rings. The coordination sphere is completed with the oxygen atom of the water molecule and an oxygen atom of a weakly coordinated perchlorate group occupying the apical position of the polyhedron. Both complex units and uncoordinated perchlorate anions are extensively hydrogen-bonded, forming bidimensional sheets.