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
.