Photocyclization Reactions of Diarylethenes via the Excited Triplet State

Ryutaro Murata; Tomoaki Yago; Masanobu Wakasa

doi:10.1021/acs.jpca.5b08205

Photocyclization Reactions of Diarylethenes via the Excited Triplet State

J Phys Chem A. 2015 Nov 12;119(45):11138-45. doi: 10.1021/acs.jpca.5b08205. Epub 2015 Nov 2.

Authors

Ryutaro Murata¹, Tomoaki Yago¹, Masanobu Wakasa¹

Affiliation

¹ Department of Chemistry, Graduate School of Science and Engineering, Saitama University , 255 Shimo-ohkubo, Sakura-ku, Saitama 338-8570, Japan.

PMID: 26490486
DOI: 10.1021/acs.jpca.5b08205

Abstract

Cyclization reactions of three diarylethene derivatives, 1,2-bis(2-methyl-3-benzothienyl)perfluorocyclopentene (BT), 1,2-bis(2-hexyl-3-benzothienyl)perfluorocyclopentene (BTHex), and 1,2-bis(2-isopropyl-3-benzothienyl)perfluorocyclopentene (BTiPr), via their excited triplet states were studied by means of steady-state and nanosecond transient absorption spectroscopy. The excited triplet states of BT, BTHex, and BTiPr were generated by energy transfer from the photoexcited triplet states of sensitizers such as xanthone, phenanthrene, and pyrene. The single-step quantum yields of the cyclization reactions from the excited triplet states of BT, BTHex, and BTiPr were determined to be 0.34, 0.53, and 0.65, respectively. The triplet energies of these three BTs were estimated to be 190-200 kJ mol(-1).