Mode- and complexation-specific singlet-triplet coupling in jet-cooled perylene studied by time-resolved fluorescence spectroscopy
✍ Scribed by Andrew J. Kaziska; Stacey A. Wittmeyer; Andrea L. Motyka; Michael R. Topp
- Book ID
- 103029264
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 686 KB
- Volume
- 154
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Fluorescence spectral data for jet-cooled perylene indicate little or no vibrational coupling for most levels up to 1057 cm-'. Fluorescence time profiles have been measured for several levels, and evidence presented for several cases of coupling to the triplet manifold. The principal Fran&-Condon-active mode 353' exhibits a single-exponential decay, although the emission spectrum indicates little or no singlet vibrational level mixing. The (CH,), complex of perylene, also excited into 353', exhibits a single-exponential profile with a fast decay, again indicating strong singlet-triplet coupling, while the 2 : 1 and 3 : 1 complexes at the same energy are strongly fluorescent. These results imply that singlet-triplet coupling is level-selective, and can be induced by complexation.