Syntheses, Electrochemistry and Reactivities of Pyridine Amide Complexes of Chromium(III) and Manganese(III)

DOI: 10.1039/DT9910001071

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 1071 - 1076 (1991)

Update date:2022-08-03

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Authors:

Leung, Wa-Hung

Ma, Ji-Xiang

Yam, Vivian Wing-Wah

Che, Chi-Ming

Poon, Chung-Kwong

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Article abstract of DOI:10.1039/DT9910001071

Reactions of anhydrous CrCl3 with H2bpb and H2bpc in dimethylformamide and manganese(III) acetate with H2bpc in methanol, yielded the respective *xH2O, *H2O and complexes.The electrochemistry of the chromium(III) amide complexes has been studied by cyclic voltammetry.They exhibit reversible oxidation couples with E⁰ values ranging from 0.28 to 0.80 V vs. ferrocenium-ferrocene.Except for (1-) which has a quasireversible reduction couple at -1.97 V, the electrochemical reductions are irreversible.The complexes ClO4, and have been shown to catalyse olefin epoxidation by iodosobenzene.With , catalytic oxidation of alkanes by PhIO has also been observed.An oxygen-rebound mechanism involving a Mn(V)=O or a Cr(V)=O intermediate is proposed for the PhIO oxidation reactions.

Full text of DOI:10.1039/DT9910001071

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