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Abstract
Solid complexes of uranyl ion with 1-phenyl-3-methyl-4-benzoyl-pyrazolons-5 (PMBP) and diphenylsulphoxide (DPSO), di-benzylsulphoxide(DBeSO), dibutylsulphoxide (DBuSO), dihexyl-sulphoxide (DHSO), dioctylsulphoxide (DOSO) and tributylpnosphate (TBP) have been isolated by solvent extraction. Analytical data establish their stoichiometry as UO2 (PMBP)2·X where X is the oxodonor. The S-O stretching frequencies and the asymmetric stretch as well as the bending frequencies of the (O-U-O) group have been empirically assigned from their IR spectra. Bands due to metal-oxygen stretching frequencies of the pyrazolone and oxo donor moieties have been assigned. The phenyl protons of the aroyl and phenyl group, methyl protons of the pyrazolone ring as well as the ∝-methylene protons of the oxo donor have been unequivocally assigned and interpreted from their PMR spectra. These complexes in general have been found to be strikingly similar to those having TTA (2-thenoyl trifluoroacetone) as the chelating ligand.
