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1 2008

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Cobalt(II), Nickel(II) and Copper(II) Complexes of Some 2'-Hydroxychalcones

Karamunge K. G., Vibhute Y. B.

Polish Journal of Chemistry

2008

Vol. 82, nr 3

559-564

Complexes of Co(II), Ni(II) and Cu(II) with 1-(2'-hydroxy-3'- iodo-5'- methylphenyl)- 3-(3,4-methylenedioxyphenyl)-2-propen-1-one (L1), 1-(2'- hydroxy-3'-bromo-5'- chlorophenyl)- 3-(3,4- methylenedioxyphenyl)-2-propen-1-one (L2) and 1-(2'- hydroxy-3'-iodo- 4'-methyl-5'-chlorophenyl)-3- (3,4-methylene dioxyphenyl)-2- propen-1- one (L3) have been prepared and characterized with the help of elemental analyses, molar conductivity, magnetic measurement, electronic spectra, infrared spectra, ESR and thermal analysis. Elemental analyses confirmed a 1:2 (metal:ligand) stoichiometry. The conductivity data show that all these complexes are non-electrolytes. The infrared spectral data indicate that the L1, L2 and L3 act as mononegative bidentate ligands with all the metal ions and the electronic spectral data suggest that all Co(II), Ni(II) complexes have pseudooctahedral geometry whereas Cu(II) complexes have square planar geometry. Presence of coorinated water molecules in Co(II), and Ni(II) complexes is confirmed by TGA studies. ESR parameters of Cu(II) complexes have been calculated and relevant conclusions have been drawn with respect to the nature of bonds present in them.