Murata Ryutaro, Yago Tomoaki, Wakasa Masanobu
Department of Chemistry, Graduate School of Science and Engineering, Saitama University , 255 Shimo-ohkubo, Sakura-ku, Saitama 338-8570, Japan.
J Phys Chem A. 2015 Nov 12;119(45):11138-45. doi: 10.1021/acs.jpca.5b08205. Epub 2015 Nov 2.
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).
通过稳态和纳秒瞬态吸收光谱法研究了三种二芳基乙烯衍生物，即1,2-双(2-甲基-3-苯并噻吩基)全氟环戊烯(BT)、1,2-双(2-己基-3-苯并噻吩基)全氟环戊烯(BTHex)和1,2-双(2-异丙基-3-苯并噻吩基)全氟环戊烯(BTiPr)经由其激发三重态的环化反应。BT、BTHex和BTiPr的激发三重态是通过从诸如呫吨酮、菲和芘等敏化剂的光激发三重态进行能量转移而产生的。BT、BTHex和BTiPr从激发三重态进行环化反应的单步量子产率分别测定为0.34、0.53和0.65。这三种BT的三重态能量估计为190 - 200 kJ mol(-1)。
