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Higher excited singlet state of diphenylacetylene in solution phase

✍ Scribed by Yoshinori Hirata; Tadashi Okada; Tateo Nomoto

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 544 KB
Volume: 209
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)80037-p

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✦ Synopsis

By using picosecond transient absorption spectral measurement techniques, we have investigated photophysical properties of several monc+substituted diphenylacetylenes (DPA). The strongly temperature dependent Sz -+S, internal conversion which was reported for DPA previously was observed for methoxy-DPA, hydroxy-DPA, and chloro-DPA. In these compounds the S2 and S, states are fluorescent 'B1. and nonfluorescent 'As or ' B IU, respectively, while the S, state of cyano-DPA and CHXCOO-DPA should be fluorescent 'I&.. The probable mechanism of the .QS, internal conversion, where the promoting vibrational mode was excited in the Sz state, was proposed on the basis of the results that the former group has a similar activation energy of the internal

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