SYNTHESIS, MAGNETIC AND SPECTRAL STUDIES OF SOME MIXED-LIGAND CHELATES OF BIS(2-HYDROXYACETOPHENONATO)COPPER(II) WITH 2-PYRAZOLINE-5-ONE OR3-PYRAZOLINE-5-ONE DERIVATIVES

A new series of novel mixed-ligand complexes of copper(II) of the comp ositions [Cu(o-haph)(2)(L)(2)]. 2H(2)O (where L = 3-methyl-2-pyrazolin e-5-one (3-MP), 4-methyl-2-pyrazoline-5-one (4-MP), 3-methyl-1-phenyl- 2-pyrazoline-5-one (MPHP), 2,3-dimethyl-1-phenyl-3-pyrazoline-5-one (D MPHP) and [Cu(o-haph)(2)(L-L)]. 2H(2)O (where L-L = 4-amino-2,3-dimeth yl-1-phenyl-3-pyrazoline-5-one (ADMPHP) and -methyl-4-nitrobenzoyl-1-p henyl-2-pyrazoline-5-one (MNBPHP) and o-haphH = o-hydroxyacetophenone) , have been synthesized by the interaction of [Cu(o-haph)(2)]. H2O wit h the said ligands. The compounds so obtained were characterized by an alytical data, molar conductances, magnetic measurements, thermogravim etric analyses, electron paramagnetic resonance, electronic and infrar ed spectral studies. We conclude from the IR data that the ligands 3-M P, 4-MP, MPHP and DMPHP behave as neutral monodentate oxygen donors wh ile the ligands ADMPHP and MNBPHP behave as neutral bidentate (0,N) an d (0,0) donors, respectively. Octahedral structures have been proposed for these complexes.