Abstract:
We investigate the equilibrium, kinetics, and mechanism of the photochromic transformation of a series of amido spirorhodamine compounds - differing in the nature of the substituents of the amido group and in the rhodamine chromophore - in ethanol at room temperature in the presence of trifluoroacetic acid. A proton participates in the equilibrium between the spiro form and the open rhodamine form. The relaxation times in the dark or under continuous irradiation show a linear dependence on the proton concentration. The slopes of these plots show a linear free energy relation with the equilibrium constant of the transformation. A mechanism involving reversible reaction steps between four states: the two thermodynamically stable isomers, a protonated spiro form, and a deprotonated open form, can account for the kinetic observations in the dark and under irradiation. © The Royal Society of Chemistry and Owner Societies 2012.
Registro:
Documento: |
Artículo
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Título: | The mechanism of the photochromic transformation of spirorhodamines |
Autor: | Montenegro, H.; Di Paolo, M.; Capdevila, D.; Aramendía, P.F.; Bossi, M.L. |
Filiación: | Departamento de Química Inorgánica, Analítica y Química Física, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, 1428, Argentina
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Año: | 2012
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Volumen: | 11
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Número: | 6
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Página de inicio: | 1081
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Página de fin: | 1086
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DOI: |
http://dx.doi.org/10.1039/c2pp05402g |
Título revista: | Photochemical and Photobiological Sciences
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Título revista abreviado: | Photochem. Photobiol. Sci.
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ISSN: | 1474905X
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CODEN: | PPSHC
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1474905X_v11_n6_p1081_Montenegro |
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Citas:
---------- APA ----------
Montenegro, H., Di Paolo, M., Capdevila, D., Aramendía, P.F. & Bossi, M.L.
(2012)
. The mechanism of the photochromic transformation of spirorhodamines. Photochemical and Photobiological Sciences, 11(6), 1081-1086.
http://dx.doi.org/10.1039/c2pp05402g---------- CHICAGO ----------
Montenegro, H., Di Paolo, M., Capdevila, D., Aramendía, P.F., Bossi, M.L.
"The mechanism of the photochromic transformation of spirorhodamines"
. Photochemical and Photobiological Sciences 11, no. 6
(2012) : 1081-1086.
http://dx.doi.org/10.1039/c2pp05402g---------- MLA ----------
Montenegro, H., Di Paolo, M., Capdevila, D., Aramendía, P.F., Bossi, M.L.
"The mechanism of the photochromic transformation of spirorhodamines"
. Photochemical and Photobiological Sciences, vol. 11, no. 6, 2012, pp. 1081-1086.
http://dx.doi.org/10.1039/c2pp05402g---------- VANCOUVER ----------
Montenegro, H., Di Paolo, M., Capdevila, D., Aramendía, P.F., Bossi, M.L. The mechanism of the photochromic transformation of spirorhodamines. Photochem. Photobiol. Sci. 2012;11(6):1081-1086.
http://dx.doi.org/10.1039/c2pp05402g