Journal
CHEMICAL PHYSICS
Volume 265, Issue 3, Pages 335-347Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0301-0104(01)00314-7
Keywords
carotenoid; polyene; absorption; stark spectra; bandwidth; conformation
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Electrooptical parameters of eight carotenoids with different molecular structures were determined from the absorption and electroabsorption (Stark) spectra in glassy solvents and in poly(methyl methacrylate) films at temperatures 108-115 K. The results point to a limited significance of solvent-induced dipole moments in carotenoids resulting from local electric fields generated by solvent molecules, and indicate that the features in Stark spectra related to apparent dipole moments display a correlation with the bandwidth of individual vibronic transitions in absorption spectra. Model calculations show that it is possible to describe the Stark spectra by assuming a close link between the molecular polarizability and the inhomogeneous spectral shift. It is postulated that the dipole-related features in Stark spectra and the inhomogeneous broadening have a common origin in the distortions of molecular geometry in the form of torsional deformations about the single C-C bonds. (C) 2001 Published by Elsevier Science B.V.
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