THE STUDY OF SOLVENT/SOLUTE INTERACTIONS USING ULTRAFAST TIME RESOLVED RAMAN SPECTROCOPY
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Date
1992
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Publisher
Ohio State University
Abstract
While much is understood on a macroscopic scale about the interactions that occur between solute and solvent in solution, the microscopic details, involving the interaction potentials between solvent and solute, transport processes, and energy transfer, are not well understood. The advent of ultrafast laser technology and supercomputers has aided in the advancement of this area over the last decade. However, experiment and theory are still ``in progress”. We are using picosecond transient Raman spectroscopy to obtain direct structural information about the interactions that occur between solute molecules and the surrounding solvent. The model chemical reactions that we are using include photoisomerization reactions, specifically the photoisomerization of trans-stilbene and cyanine dyes. We have shown that the interactions that occur between the solvent and trans-stilbene result in mode specific, solvent dependent variations in the picosecond transient Raman spectrum [1]. We have characterized the ground state Raman spectra of the cyanine dyes [2] and have also begun an investigation of the effect of solvent on the excited state spectra of several cyanine dyes, including DODCI and its sulfur substituted analogue. The excited state spectra are significantly more complex than the simple diphenylpolyenes. We will present excited state Raman spectra for some of our model photoisomerization reactions.
Description
[1] W. L. Weaver, L. A. Huston, K. Iwata, and T. L. Gustafson, J. Phys. Chem., Submitted for publication. [2] K. Iwata, W. L. Weaver, and T. L. Gustafson, unpublished results.
Author Institution: Department of Chemistry, The Ohio State University; Kanagawa Academy of science and Technology, Molecular Spectroscopy Laboratory; Department of Chemistry, The Ohio State University
Author Institution: Department of Chemistry, The Ohio State University; Kanagawa Academy of science and Technology, Molecular Spectroscopy Laboratory; Department of Chemistry, The Ohio State University