Photochemical and spectroscopic studies of small model polyenes related to vision

Anne B. Myers; David Lee Phillips; Xiaopei Ci; Curtis L. Westerfield; Jon-Marc Rodier

doi:10.1117/12.145245

1 May 1993 Photochemical and spectroscopic studies of small model polyenes related to vision

Anne B. Myers, David Lee Phillips, Xiaopei Ci, Curtis L. Westerfield, Jon-Marc Rodier

Proceedings Volume 1890, Biomolecular Spectroscopy III; (1993) https://doi.org/10.1117/12.145245
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

The photochemistry of vision involves the ultrafast cis-trans photoisomerization and efficient excited-state deactivation of a polyene aldehyde chromophore. We have been studying the photophysics of smaller model systems that also exhibit some of these properties. Resonance Raman and preliminary picosecond time-resolved absorption experiments on butadiene and cis- and trans-1,3,5-hexatriene in vapor and solution phases have been analyzed to characterize the structure and dynamics of both the optically allowed B state and the lowest singlet excited A state. Solvent polarizability is found to have a large effect on the B-state torsional potentials, particularly in trans-hexatriene. Related studies including picosecond two-color pump-probe Raman measurements on the ultrafast photoreactions of cis-stilbene are also described. These experiments probe the initial vibrational energy distribution and subsequent relaxation of the initially formed trans-stilbene, as well as the partitioning between the cis-trans isomerized and ring-closed products. Significant solvent polarity effects are observed on both the excited-state photochemistry and the ground-state vibrational relaxation.

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Anne B. Myers, David Lee Phillips, Xiaopei Ci, Curtis L. Westerfield, and Jon-Marc Rodier "Photochemical and spectroscopic studies of small model polyenes related to vision", Proc. SPIE 1890, Biomolecular Spectroscopy III, (1 May 1993); https://doi.org/10.1117/12.145245

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