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Abstract:

We have employed diheteroarylethenes as acceptors for photochromic FRET (pcFRET), a technique introduced for the quantitative determination of fluorescence resonance energy transfer (FRET). In pcFRET, the fluorescent emission of the donor is modulated by cyclical transformations of a photochromic acceptor. Light induces a reversible change in the structure and, concomitantly, in the absorption properties of the acceptor. Only the closed forms of the selected diheteroarylethenes 2a and 2b have an absorption band overlapping the emission band of the donor, 1. The corresponding variation in the overlap integral (and thus critical transfer distance Ro) between the two states provides the means for reversibly switching the process of FRET on and off, allowing direct and repeated evaluation of the relative changes in the donor fluorescence quantum yield. The diheteroarylethenes demonstrate excellent stability in aqueous media, an absence of thermal back reactions, and negligible fatigue. The equilibration of these systems after exposure to near-UV or visible light follows simple monoexponential kinetics. We developed a general conceptual scheme for such coupled photochromic-FRET reactions, allowing quantitative interpretations of the photostationary and kinetic data, from which the quantum yields for the cyclization and cycloreversion reactions of the photochromic acceptor were calculated.

Registro:

Documento: Artículo
Título:Diheteroarylethenes as thermally stable photoswitchable acceptors in photochromic fluorescence resonance energy transfer (pcFRET)
Autor:Giordano, L.; Jovin, T.M.; Irie, M.; Jares-Erijman, E.A.
Filiación:Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, PROPLAME-CONICET, Pabellón II, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, D-37077 Göttingen, Germany
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Higashi-ku, 812, Japan
Palabras clave:Quantum yields; Electromagnetic wave emission; Energy transfer; Fluorescence; Photochromism; Reaction kinetics; Organic compounds; ethylene derivative; article; calculation; chemical modification; cyclization; fluorescence; fluorescence resonance energy transfer; molecular stability; quantitative analysis; quantum theory; structure analysis; thermostability; ultraviolet radiation
Año:2002
Volumen:124
Número:25
Página de inicio:7481
Página de fin:7489
DOI: http://dx.doi.org/10.1021/ja016969k
Título revista:Journal of the American Chemical Society
Título revista abreviado:J. Am. Chem. Soc.
ISSN:00027863
CODEN:JACSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027863_v124_n25_p7481_Giordano

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Citas:

---------- APA ----------
Giordano, L., Jovin, T.M., Irie, M. & Jares-Erijman, E.A. (2002) . Diheteroarylethenes as thermally stable photoswitchable acceptors in photochromic fluorescence resonance energy transfer (pcFRET). Journal of the American Chemical Society, 124(25), 7481-7489.
http://dx.doi.org/10.1021/ja016969k
---------- CHICAGO ----------
Giordano, L., Jovin, T.M., Irie, M., Jares-Erijman, E.A. "Diheteroarylethenes as thermally stable photoswitchable acceptors in photochromic fluorescence resonance energy transfer (pcFRET)" . Journal of the American Chemical Society 124, no. 25 (2002) : 7481-7489.
http://dx.doi.org/10.1021/ja016969k
---------- MLA ----------
Giordano, L., Jovin, T.M., Irie, M., Jares-Erijman, E.A. "Diheteroarylethenes as thermally stable photoswitchable acceptors in photochromic fluorescence resonance energy transfer (pcFRET)" . Journal of the American Chemical Society, vol. 124, no. 25, 2002, pp. 7481-7489.
http://dx.doi.org/10.1021/ja016969k
---------- VANCOUVER ----------
Giordano, L., Jovin, T.M., Irie, M., Jares-Erijman, E.A. Diheteroarylethenes as thermally stable photoswitchable acceptors in photochromic fluorescence resonance energy transfer (pcFRET). J. Am. Chem. Soc. 2002;124(25):7481-7489.
http://dx.doi.org/10.1021/ja016969k