Femtosecond Spectroscopic Study on Photochromic Diarylethenes with Terthiophene
作者:
N. Ohtaka,
Y. Hase,
K. Uchida,
M. Irie,
N. Tamai,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 344,
issue 1
页码: 83-88
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008023818
出版商: Taylor & Francis Group
关键词: diarylethene;terthiophene;femtosecond transient absorption spectroscopy;Woodward-Hoffmann rule
数据来源: Taylor
摘要:
Photochromic ring-closure reactions of diarylethene derivatives with terthiophene (T3H, T3Me) have been examined by femtosecond transient absorption spectroscopy. The rate of the ring-closure reaction of T3H in n-hexane was estimated to be ∼ 2.5 ps, which is very similar to that of T3Me in the same solvent. It was suggested that the ring-closure reaction proceeds through a concerted mechanism without any intermediates but not a two-step mechanism. The rate of ring-closure reaction was also dependent on the solvent polarity, suggesting that the charge transfer state in the excited singlet state plays an important role in the photochromic reaction.
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