Excited-state dynamics of pentacene derivatives with stable radical substituents

Akitaka Ito; Akihiro Shimizu; Noriaki Kishida; Yusuke Kawanaka; Daisuke Kosumi; Hideki Hashimoto; Yoshio Teki

doi:10.1002/anie.201310291

Excited-state dynamics of pentacene derivatives with stable radical substituents

Angew Chem Int Ed Engl. 2014 Jun 23;53(26):6715-9. doi: 10.1002/anie.201310291. Epub 2014 Apr 30.

Authors

Akitaka Ito¹, Akihiro Shimizu, Noriaki Kishida, Yusuke Kawanaka, Daisuke Kosumi, Hideki Hashimoto, Yoshio Teki

Affiliation

¹ Division of Molecular Materials Science, Graduate School of Science, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585 (Japan).

PMID: 24788384
DOI: 10.1002/anie.201310291

Abstract

The excited-state dynamics of pentacene derivatives with stable radical substituents were evaluated in detail through transient absorption measurements. The derivatives showed ultrafast formation of triplet excited state(s) in the pentacene moiety from a photoexcited singlet state through the contributions of enhanced intersystem crossing and singlet fission. Detailed kinetic analyses for the transient absorption data were conducted to quantify the excited-state characteristics of the derivatives.

Keywords: intersystem crossing; pentacene derivatives; radicals; singlet fission; time-resolved spectroscopy.