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Title: Synthesis, characterization and biological studies of oxovanadium(IV), manganese(II), iron(II), cobalt(II), nickle(II) and copper(II) complexes derived from a quadridentate ligand
Authors: Rao, P Venkateswar
Narasaiah, A Venkata
Issue Date: Aug-2003
Publisher: NISCAIR-CSIR, India
Abstract: nbsp; The solid complexes of oxovanadium(IV), Mn(II), Fe(II), Co(II), Ni(II) and (Cu(II) with a new quadridentate ligand (DHACH), derived from 3-acetyl-6-methyl-2H-pyran-2,4 (3H)dione (dehydroacetic acid) and carbohydrazide, have been synthesized and characterized by analytical, conductivity, thermal, magnetic, IR , 1H NMR, UV-vis, mass and ESR spectral data. From the analytical and thermal data, the stoichiometry of the complexes has been found to be 1:1 (metal:ligand). The metal chelates have a general formula [M(DHACH).2H2O], where M=Mn(II), Fe(II), Co(II), Ni(II) and Cu(II). Oxovanadium(IV) complex has the composition [VO(DHACH).H2O], IR spectral data suggest that the ligand, DHACH behaves as a dibasic quadridentate ligand with O:N:N:O donor sequence towards metal ions. The physico-chemical data suggest that all the complexes possess ocatahedral stereochemistry. The fungicidal activities of the ligand and the metal complexes have been screened ill vitro against the organism Aspergillus niger and the percentage of inhibition has been found to be in the order:

  Cu(II)>Ni(II)> Fe(II)>Co(II)> Mn(II)>VO(IV)
Page(s): 1896-1899
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.42A(08) [August 2003]

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