SPECTROSCOPIC STUDY OF CHLOROPHYLL a IN ORGANIC SOLVENTS AND POLYMERIZED ANHYDROUS POLYVINYL MATRIX |
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| Authors: | Marc A M J van Zandvoort Danuta Wroabel Andries J Scholten Dries de Jager Glis van Ginkel Yehudi K Levine |
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| Institution: | Department of Molecular Biophysics, University of Utrecht, Buys Ballot Laboratory, Princetonplein 5, 3584 CC Utrecht, The Netherlands;Institute of Physics, Poznad Technical University, Piotrowo 3, 60–965-Poznan, Poland;Department of Condensed Matter Physics, University of Utrecht, Buys Ballot Laboratory, Princetonplein 5, 3584 CC Utrecht, The Netherlands |
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| Abstract: | In this paper we present a spectroscopic study of chlorophyll a in solutions and in anhydrous polyvinyl alcohol films. Absorption, excitation and emission spectra, combined with fluorescence lifetime and time-resolved anisotropy measurements show that chlorophyll a in anhydrous polyvinyl alcohol films exists in a purely monomeric state. Furthermore, it appears that the monomeric chlorophyll a exhibits an efficient excitation energy transfer in this polyvinyl alcohol matrix. These results are rationalized in terms of a model in which the chlorophyll a molecules are located within pockets, formed by the polymer chains. It is concluded that the chlorophyll a-anhydrous polyvinyl alcohol film is a suitable system for studying energy transfer processes, especially because the factors governing energy transfer such as mutual orientation and separation of the molecules can easily be controlled. |
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