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Proceedings Paper

Photophysics of 1,3,5-triaryl-2-pyrazolines
Author(s): Melville R. V. Sahyun; G. P. Crooks; D. K. Sharma
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Paper Abstract

The photophysics of 1,3,5-triphenyl-2-pyrazoline (I) and 1,3-diphenyl-5-(p-nitrophenyl)-2- pyrazoline (II) have been probed using steady-state and time-resolved fluorescence spectroscopy, laser flash transient absorption spectroscopy, and photochemical observations. II (and to a lesser extent, I) undergoes efficient H-D exchange at the 5-position on the pyrazoline ring when irradiated at 365 nm in CD3OD. These observations are interpreted in terms of initial photoexcitation to S2, which partitions between S1 and a non-emissive intramolecular charge-transfer state. This viewpoint helps rationalise some of the differences between solution and solid state photophysics of the pyrazolines.

Paper Details

Date Published: 1 March 1991
PDF: 9 pages
Proc. SPIE 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films, (1 March 1991); doi: 10.1117/12.45124
Show Author Affiliations
Melville R. V. Sahyun, 3M Co. (United States)
G. P. Crooks, 3M Co. (United States)
D. K. Sharma, Concordia Univ. (India)

Published in SPIE Proceedings Vol. 1436:
Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films
Marcus F. Lawrence; Arthur Jesse Frank; S. Ramasesha; Carl C. Wamser, Editor(s)

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