Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 63, Issue 18, Pages 3279-3290Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2010.508516
Keywords
Schiff bases; 4-Acyl-5-pyrazolones; Metal chelates; Bisketimines; Ligand field parameters
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Funding
- UGC, New Delhi, India
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The oxovanadium(IV), Cr(III), Ni(II), Co(II), and Cu(II) chelates of some bisketimino Schiff-base ligands (H2L) obtained by condensation of 4-butyryl-3-methyl-1-phenyl-(or-1,3-diphenyl)-2-pyrazolin-5-ones with thiourea were synthesized and characterized by elemental analyses and thermogravimetric analyses, molar conductivities, magnetic susceptibility measurements, mass, infrared, and electronic spectroscopies. Ligand field parameters, such as splitting energy, Racah parameter, spin-orbit coupling constant, and covalency parameter of the Cr(III), Ni(II), and Co(II) chelates were calculated by band-fitting methods. Based on these studies, tetragonally distorted octahedral environment around OV(IV) and Cu(II) and octahedral Cr(III), Ni(II), and Co(II) have been proposed.
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