Bandshape Parameters’ Dependence on Solvent in Raman Excitation Profiles, and Absorption Spectra of Violaxanthin and Lutein
Gia G. Maisuradze A BA Department of Chemistry, Oklahoma State University, Stillwater OK 74078, USA.
B Current address: Department of Chemistry and Chemical Physics Program, University of Nevada, Reno NV 89557, USA. Email: gia@chem.unr.edu
Australian Journal of Chemistry 57(11) 1109-1115 https://doi.org/10.1071/CH04092
Submitted: 14 April 2004 Accepted: 13 September 2004 Published: 1 November 2004
Abstract
The experimental results of resonance Raman excitation profiles (RREPs) for the Ω1, Ω2, and Ω3 vibrations of violaxanthin and lutein in acetone, toluene, and carbon disulfide have been interpreted in terms of an improved vibronic interaction theory. The bandshape parameters from RREPs have been employed for the calculation of absorption spectra. Excellent agreement between calculated and observed RREPs and absorption spectra was found. However, the results obtained for RREPs of lutein in carbon disulfide deviate considerably from experiment. The results indicate that the major broadening mechanism is homogeneous in carbon disulfide, whereas the broadening in acetone and toluene includes contributions from both homogeneous and inhomogeneous mechanisms.
Acknowledgement
G.G.M. thanks the Chemistry Department of Oklahoma State University, where the most of the calculations have been done.
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* The inclusion of fourth active mode did not improve the fit with experimental results. Also, in previous studies the peak at 1180 cm−1 was not included in the calculations.
