期刊
RESEARCH ON CHEMICAL INTERMEDIATES
卷 39, 期 1, 页码 321-345出版社
SPRINGER
DOI: 10.1007/s11164-012-0652-4
关键词
Fluorescence; Intersystem crossing; Naphthalene; Triplet-triplet absorption; Triple bond
资金
- JSPS [23350059, 20550049, 23550047]
- Ministry of Education, Culture, Sports, Science, and Technology, Japan
- Grants-in-Aid for Scientific Research [23550058] Funding Source: KAKEN
Photophysical and photochemical properties of naphthalenes substituted with trimethylsilylethynyl, tert-butylethynyl, and trimethylsilylbutadiynyl groups were investigated by measurement of fluorescence yields, lifetimes, and triplet absorption. Introducing trimethylsilylethynyl and tert-butylethynyl groups to the 1-position of the naphthalene skeleton substantially enhanced fluorescence and intersystem crossing (ISC). The rates of fluorescence of 2-substituted naphthalenes were low. The effect of ethynyl groups on the 1-substituted naphthalenes was rationalized in terms of an increase of the transition moment along the short axis of the naphthalene skeleton. Substitution of the trimethylsilylbutadiynyl group at the 1 or 2-position of the naphthalene skeleton caused a considerable decrease in the fluorescence yield (approximately 0.01) and an increase in the ISC yield (0.99).
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