The copper(II), nickel(II) and palladium(II) chelates of bis-(pivaloylacetone)mesostilbenediimine(meso-H2PA2S) and copper(II), nickel(II), palladium(II) and vanadium(IV) oxide chelates of bis-(pivaloylacetone) dl-stilbenediimine(dl- H2PA2S) were prepared and characterised using IR, (H-NMR)-H-1 and mass spectroscopic techniques. Spectrophotometric studies, TGA and DTA of metal complexes were also carried out. The complexes are sufficiently volatile and thermally stable and elute easily on GLC columns with linear calibration range within 125-3760 ng and detection limits within 2.8-19 ng of metal ion. Separations between copper, nickel, palladium and vanadium oxide chelates have been achieved, but some overlapping between copper and nickel complexes is obtained. A mixture of metal complexes of meso-and dl-isomers could also be resolved.
A I SOOMRO ,M Y KHUHAWAR ,A G M VASANDANI ,
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