Sumanenetrione anions generated by electrochemical and chemical reduction

Shuhei Higashibayashi, Binod Babu Shrestha, Yuki Morita, Masahiro Ehara, Kei Ohkubo, Shunichi Fukuzumi, Hidehiro Sakurai

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The electrochemical reduction of sumanenetrione by cyclic voltammetry showed stepwise multielectron reduction. Cyclic voltammograms of the stepwise first and second one-electron reduction exhibited reversible waves with associated reduction potentials that were almost equivalent to those of C60. EPR studies of the chemically generated monoanion and dianion of sumanenetrione, in conjunction with theoretical calculations, revealed their structures. The radical anion exhibited C3v symmetric spin delocalization over the entire bowl structure. The radical anion exhibited several absorption bands covering the whole visible to near-IR region. The nature of excitations was assigned by SAC/SAC-CI SD-R calculations. The dianion has a singlet ground state with a large energy gap between the singlet and triplet states. The dianion, too, has C3v symmetry with delocalization over the bowl structure. The major contributing structure of the dianion is the closed-shell configuration rather than the open-shell biradical configuration.

Original languageEnglish
Pages (from-to)1297-1299
Number of pages3
JournalChemistry Letters
Issue number8
StatePublished - 2014

Bibliographical note

Publisher Copyright:
© 2014 The Chemical Society of Japan.


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