Determination of the distance law of the transfer of electronic excitation energy

P. Maróti, G. Laczkó, L. Szalay

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In a frequently applied method the exponent, n, of the distance R, of interacting molecules, appearing in the expression of the efficiency, f, of transfer, is determined from the slope of a straight line obtained by plotting In (f−1 −1) vs. In c/c0 (c and c0 are the concentration of the solution and a constant critical concentration characteristic of the interacting molecules and their environment, as defined in the Förster theory of transfer). The dependence of f on c is usually determined experimentally from the concentration quenching of fluorescence. From the theoretical quenching curve and the analytical expression for the slope, it is concluded that In (f−1 −1) vs. In c/c0 is not strictly linear, but a curve with slopes yielding exponents from n = −6−n = −3, in contrast to the fact that the interaction theoretically remains very weak (with n = −6). A correct exponent is obtained experimentally from the high-concentration part of the quenching curve or by using the theoretical dependence of the slope on the concentration in the case of very weak interactions. For strong interactions, In (f−1 −1) vs. In c/c0 is linear, and n = −3 in the whole concentration range. However, f is slightly volume-dependent.

Original languageEnglish
Pages (from-to)663-671
Number of pages9
JournalJournal of Theoretical Biology
Issue number4
Publication statusPublished - Jan 1 1980

ASJC Scopus subject areas

  • Statistics and Probability
  • Modelling and Simulation
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)
  • Applied Mathematics

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