1 March 1991 Photophysics of 1,3,5-triaryl-2-pyrazolines
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Proceedings Volume 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films; (1991) https://doi.org/10.1117/12.45124
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States
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.
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Melville R. V. Sahyun, Melville R. V. Sahyun, G. P. Crooks, G. P. Crooks, D. K. Sharma, D. K. Sharma, } "Photophysics of 1,3,5-triaryl-2-pyrazolines", Proc. SPIE 1436, Photochemistry and Photoelectrochemistry of Organic and Inorganic Molecular Thin Films, (1 March 1991); doi: 10.1117/12.45124; https://doi.org/10.1117/12.45124
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