Circular dichroism studies of Pfeiffer active vanadium(III) and chromium(III) complexes of ethylenediaminetetracetate (EDTA(4-)) and diethylenetriaminepentacetate (DTPA(5-)) ions

The Pfeiffer effect has been investigated in aqueous solution of [Cr(EDTA)H2O](-), [Cr(DTPA)](2-). [V(EDTA)](-) and [V(DTPA](2-) ions in presence of various chiral environment substances, such as (+)-cinchonine HCl, (-)-cinchonidine HCl, (+)-tartaric acid and (-)-tartaric acid, (+)-alpha-methylbenzylamine HCl, (+)-ascorbic acid, (-)-brucine HCl and (-)-ephedrine HCl. The CD spectra of these complex ions in presence of different chiral environment substances have been reported and Cotton bands assigned to electronic transitions. From the Pfeiffer effect and CD studies, (+)(D)-[Cr(EDTA). H2O](-), (+)(D)-[Cr(DTPA)](2-), (+)(D)-[V(EDTA)](-) and (+)(D)-[V(DTPA)](2-) are assigned Delta absolute configuration around the metal ions.

CHRISTY MUNIR ,SYED RAUF ,NASIR AHMAD ,