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Proceedings Paper

Site-selective red-edge spectroscopy of disordered materials and microheterogeneous systems: polymers, phospholipid membranes and proteins
Author(s): Alexander P. Demchenko; Sebnem Ercelen; Andriy S. Klymchenko
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Paper Abstract

For aromatic fluorophores embedded into different rigid and highly viscous media with low structural order the spectroscopic properties do not conform to classical rules. The fluorescence spectra can depend on excitation wavelength, and the excited-state energy transfer, if present, fails at the 'red' excitation edge. These Red-Edge effects are observed due to the existence of excited-state distribution of fluorophores on their interaction energy with the environment and the slow rate of dielectric relaxations. In these conditions the site-selection can be provided by variation of energy of illuminating light quanta, and the behavior of selected species can be followed as a function of time and other variables. These observations foudn extensive application in different areas of research: colloid and polymer science, photophysics and molecular biophysics. Site-selection effects were discovered for electron-transfer and proton-transfer reactions if they depend on the dynamics of the environment. In this report we concentrate on fluroescence of 3-hydroxyflavone derivatives as the probes that exhibit the excited-state proton transfer reaction. The studies in polymer films, phospholipid membranes and in complexes with proteins allow characterizing the static and dynamic disorder in these systems.

Paper Details

Date Published: 11 December 2002
PDF: 11 pages
Proc. SPIE 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals, (11 December 2002); doi: 10.1117/12.486641
Show Author Affiliations
Alexander P. Demchenko, TUBITAK Marmara Research Ctr. (Turkey)
A.V. Palladin Institute of Biochemistry (Ukraine)
Sebnem Ercelen, TUBITAK Marmara Research Ctr. (Turkey)
Andriy S. Klymchenko, TUBITAK Marmara Research Ctr. (Turkey)


Published in SPIE Proceedings Vol. 4938:
Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals
Galina A. Puchkovska; Sergey A. Kostyukevych, Editor(s)

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