Electronic-energy migration and molecular rotation within bichromophoric macromolecules. Part 1.—Test of a model using bis(9-anthrylmethylphoshonate) bisteroid

Autor:	Irina V. Grechishnikova, Julian G. Molotkovsky, Peter Edman, Fredrik Bergström, Lennart B.-Å. Johansson
Rok vydání:	1996
Předmět:	Crystallography Chemistry Energy transfer Energy migration Molecule Molecular rotation Physical and Theoretical Chemistry Electronic energy Anisotropy Molecular physics Fluorescence anisotropy Macromolecule
Zdroj:	J. Chem. Soc., Faraday Trans.. 92:1563-1567
ISSN:	1364-5455 0956-5000
DOI:	10.1039/ft9969201563
Popis:	We report a model for determining the rate of energy migration, within pairs of donor (D) molecules from the fluorescence anisotropy. The D molecules within each pair reside in an anisotropic environment, and undergo rotational motions, similar to what could be the case in a protein molecule. To test the model experimentally, we have synthesized mono- and bis-(9-anthryl-methylphosphonate) bisteroid molecules. A procedure is presented for extracting the rate of energy transfer, as well as the D–D distance from the fluorescence anisotropy. The rate of energy migration obtained from experiments, ω≈ 3.5 × 108 s–1, agrees very well with that predicted. The distance 23.7 ± 2 A between the anthracenes and the mutual angle of 131 ± 3° between their orientational distributions, obtained at different temperatures, are in excellent agreement with independently determined values.
Databáze:	OpenAIRE
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