COMPARATIVE GAS-CHROMATOGRAPHIC ELUTION OF COPPER AND NICKEL-COMPLEXES OF SOME FLUORINATED TETRADENTATE KETOAMINES

Copper(II) and nickel(II) complexes of new tetradentate Schiff base bis(trifluoroacetylacetone)phenylethylenediimine (TFA2PE) have been prepared and characterized using IR, IH-NMR and mass spectroscopic techniques. The metal complexes are studied spectrophotometrically and their thermal stabili­ties are checked using TG and DTA. The complexes, together with the copper and nickel complexes of bis(trifluoroacetylacetone)ethylenediimine (TFA2en),bis(trifluoroacetylacetone)propylenediimine (TFA2Pn), bis(trifluoroacetyl­acetone )dl-st il benedi i mi ne (dl- TFA2S) and bi s- (tri fl uoroacetyl acetone )meso­stilbenediimine (meso-TFA2S) have been eluted on gas chromatographic columns with OVIOI, OV-17 and Dexil 400 GC and the effect of methyl and phenyl groups substitution on the elution of the copper and nickel complexes is established. The methyl group substitution is decreasing the retention time and phenyl group substitution at bridge position is increasing the retention times of both copper and nickel complexes, but the complexes maintain charac­teristic stability and elutes as symmetrical peaks.

G Q KHASKHELI ,M Y KHUHAWAR ,