Pyrene-dihydrophenazine bis(radical cation) in a singlet ground state

Shuichi Suzuki; Takuma Takeda; Masato Kuratsu; Masatoshi Kozaki; Kazunobu Sato; Daisuke Shiomi; Takeji Takui; Keiji Okada

doi:10.1021/ol9009927

Pyrene-dihydrophenazine bis(radical cation) in a singlet ground state

Org Lett. 2009 Jul 2;11(13):2816-8. doi: 10.1021/ol9009927.

Authors

Shuichi Suzuki¹, Takuma Takeda, Masato Kuratsu, Masatoshi Kozaki, Kazunobu Sato, Daisuke Shiomi, Takeji Takui, Keiji Okada

Affiliation

¹ Department of Chemistry, Graduate School of Science, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan.

PMID: 19552463
DOI: 10.1021/ol9009927

Abstract

A new pyrene-dihydrophenazine dyad was prepared. Oxidation of the neutral species produced a bis(radical cation) species, which was characterized by the absorptions of their component radical cations in the visible region. A thermally accessible triplet state was observed in the ESR measurement in frozen n-PrCN. The energy gap between the singlet and triplet states was determined to be 2J/k(B) = -36 +/- 3 K.