A series of eight ternary
complexes, viz. [Cu(phen)(acac)] Cl
and Cu(phen)L(H2O)n(phen = o-phenanthroline; L = a
bidentate oxygen donor ligand; n = 0, 1 or 2), have been prepared and
characterized by microanalysis, infrared spectral and electronic spectral
measurements. The results indicate that the Cu(phen)2+ species has a
great affinity for oxygen donor ligands resulting in chelate rings of varying
sizes. Infrared spectral data indicate that the Cu-O bond weakens as the oxygen
donor chelate ring increases in size; the Cu-N bond appears to be less
sensitive to ring size. Tentative assignments for the electronic absorption
bands have also been made.
Four disulphonyl carbon
acids, (PhCH2SO2)2CHY (Y = H, Ph,p-CNC6H4,p-
NO2C6H4), have been synthesized and their
ionization constants determined by spectrophotometric measurements in 80% (w/w)
dimethyl sulphoxide- water at 25�C. The pKa values, ranging from 11.65�0.02
to 7.75�0.02, present strong evidence for the conjugative effect of the two
sulphonyl groups attached to the carbon acids.
A series of
bis(benzylthio)methanes, C6H5CH2SCHYSCH2C6H5
with Y = p-FC6H4, p-ClC6H4, p-BrC6H4,
p-CH3C6H4, p-CH3OC6H4
and CH3, and the corresponding bis(benzylsulphonyl)-methanes, C6H5CH2SO2CHYSO2CH2C6H5,
have been synthesized and their 1H N.M.R. spectra examined. Magnetic
non- equivalence of the methylene protons has been observed in both series.
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