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Studies on some VO(IV), Ni(II) and Cu(II) complexes of non-symmetrical tetradentate Schiff-bases

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Author(s): Aderoju A. Osowole

Journal: Bulletin of the Chemical Society of Ethiopia
ISSN 1011-3924

Volume: 22;
Issue: 2;
Start page: 219;
Date: 2008;
Original page

Keywords: Coordination chemistry | Magnetically dilute | Non-electrolyte | Non-symmetrical Schiff base

ABSTRACT
The coordination chemistry of VO(IV), Ni(II) and Cu(II) with unsymmetrical Schiff base ligands, [HO(OCH3)C6H3C(CH3):N(CH2CH2)N:C(CH3)CH:C(C6H5)OH], H2L and [HO(OCH3)C6H3C(CH3):N(CH2CH2)N:C(CH3)CH:C(CH3)OH], H2L1 (derived from condensation of 1-phenyl-1,3-butanedione/2,4-pentanedione, ethylenediamine and 5-methoxy-2-hydroxy acetophenone) is discussed. The metal complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility, infrared and electronic spectral measurements. They are magnetically dilute, non-electrolytes in nitromethane. The ligands are tetradentately coordinating via the imine N and enolic O atoms, resulting in 5-coordinate square-pyramidal geometry for the VO(IV) complexes and 4-coordinate square-planar geometry for the Ni(II) and Cu(II) complexes. The assignment of geometry is supported by magnetic and spectral measurements.
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