Simultaneous Observation of Triplet and Singlet Cyclopentane-1,3-diyl Diradicals in the Intersystem Crossing Process
Takemi Mizuno A , Manabu Abe A B D and Noriaki Ikeda C
+ Author Affiliations
- Author Affiliations
A Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-hiroshima, Hiroshima 739-8526, Japan.
B Japan Science and Technology Agency (JST)-CREST, K’s Gobancho, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan.
C Department of Materials Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki Gosyo Kaidocho, Sakyo-ku, Kyoto 606-8585, Japan.
D Corresponding author. Email: mabe@hiroshima-u.ac.jp
Australian Journal of Chemistry 68(11) 1700-1706 https://doi.org/10.1071/CH15062
Submitted: 5 February 2015 Accepted: 1 March 2015 Published: 1 April 2015
Abstract
Intersystem crossing is an important chemical process. In this study, the rate constant of intersystem crossing, kISC ~3 × 107 s–1, for cyclopentane-1,3-diyl diradicals was unequivocally determined by the simultaneous observation of the decay process of the triplet diradical (λobs = 320 nm) and the growth process of the corresponding singlet diradical (λobs = 560 nm). The two spin states were directly observed using a long-lived singlet 2,2-dimethoxy-1,3-diphenylcyclopentane-1,3-diyl diradical.
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