Photophysics of 1,3,5-triaryl-2-pyrazolines

Melville R. V. Sahyun; G. P. Crooks; D. K. Sharma

doi:10.1117/12.45124

1 March 1991 Photophysics of 1,3,5-triaryl-2-pyrazolines

Melville R. V. Sahyun, G. P. Crooks, D. K. Sharma

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.

Citation Download Citation

Melville R. V. Sahyun, G. P. Crooks, and 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); https://doi.org/10.1117/12.45124

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