Abstract
Abstract The UV-vis, circular dichroism (CD) and cyclic voltammetry (CV) measurements of the binary systems chromium(III), chromium(VI) or peroxochromium(VI)- d -tartaric or dl -mandelic acid have been studied in aqueous media at different pH. The electronic spectra of the binary mixtures chromium(III) or peroxochromium(VI)-ligand contained the expected d-d transition for a d 3 chromium(III) ion in octahedral symmetry. Strong Cotton effects were observed for the solutions of chromium(III) or peroxochromium(VI) d -tartaric acid. The parameters D q , B , β 35 and the interelectronic repulsion parameter with the ionic charge, Z∗ , for the species formed provide reassurance that the hydroxyacid oxygen was complexed to chromium(III) ion. Equilibrium quotients for some of the chromium(III) complex species were calculated at pH ⋍6.5 .
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