Add time:08/21/2019         Source:sciencedirect.com

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 d3 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 Dq, B, β35 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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