Vibrational states of chlorophyll and related compound molecules. Metal complexes of octaethylchlorin |
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| Affiliation: | 1. Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan;2. Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan;3. Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan;4. Institute for Nanoscience Design, Osaka University, Toyonaka, Osaka 560-0043, Japan;5. Handairigaku Techno-Research, Toyonaka, Osaka 560-0043, Japan;1. Technical University of Kosice, Letna 9, 042 00 Kosice, Slovak Republic;2. Faculty of Mechanical Engineering, Technical University of Kosice, Letna 9, 042 00 Kosice, Slovak Republic;3. Faculty of Electrical Engineering and Informatics, Technical University of Kosice, Letna 9, 042 00 Kosice, Slovak Republic |
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| Abstract: | Fine-structure fluorescence spectra and i.r. spectra of the model compound chlorophyll-Zn-octaethylchlorin (Zn OEC), and its three deuterated derivatives at meso-positions and Zn OEC-15N4 have been obtained. Polarization measurements for individual zero-phonon lines show that in the vibronic spectra of the above compounds the totally symmetric vibrations are mainly active. A joint analysis of the experimental data and calculation results of normal vibrations has served as a basis for the interpretation of the spectra obtained as well as resonance Raman spectra. It is pointed out that the vibrations of ethyl substituents largely form a vibrational structure of the vibronic Zn OEC spectrum. An assignment of some lines in a fine-structure spectrum of chlorophyll a is discussed. |
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