Abstract:
Absorption and emission spectra of the merocyanine (MC) form of 6- nitrobenzospiropyran (SP), as well as the kinetics of the thermal decay of MC to SP, were measured in solvent mixtures of ethanol-hexane, ethanol-toluene and acetonitrile-toluene. For all these mixtures, the Stokes shift of MC shows the same linear dependence with the solvent parameter E(T)(30). The thermal decay kinetics is monoexponential in acetonitrile-toluene mixtures and biexponential in those containing ethanol. The activation parameters of the rate constants display very different behaviours with E(T)(30): whereas ΔG≠ is linear in this parameter, E(a) shows abrupt variations with this polarity parameter. This is compensated by changes in ΔS≠, resulting in a linear correlation between E(a) and ΔS≠.
Registro:
Documento: |
Artículo
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Título: | Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents |
Autor: | Wetzler, D.E.; Aramendía, P.F.; Japas, M.L.; Fernández-Prini, R. |
Filiación: | INQUIMAE, Depto. de Quimica Inorgánica, Analitica y Quimica Física, Pabellón 2, 1428 Buenos Aires, Argentina Unidad de Actividad Química, CNEA, Libertador 8250, 1428 Buenos Aires, Argentina Esc. de Ciencia y Tecnología, Univ. Nac. de Gen. S. Martín, Alem 3901, 1653-Villa Ballester, Prov. Buenos Aires, Argentina
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Palabras clave: | acetonitrile; alcohol; benzene derivative; hexane; merocyanine; nitrogen derivative; pyran derivative; solvent; toluene; article; chemical reaction kinetics; chemical structure; controlled study; enthalpy; photochemistry; spectroscopy |
Año: | 1999
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Volumen: | 1
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Número: | 21
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Página de inicio: | 4955
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Página de fin: | 4959
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DOI: |
http://dx.doi.org/10.1039/a905273i |
Título revista: | Physical Chemistry Chemical Physics
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Título revista abreviado: | Phys. Chem. Chem. Phys.
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ISSN: | 14639076
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CODEN: | PPCPF
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CAS: | acetonitrile, 75-05-8; alcohol, 64-17-5; hexane, 110-54-3; merocyanine, 62796-23-0; toluene, 108-88-3
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v1_n21_p4955_Wetzler |
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Citas:
---------- APA ----------
Wetzler, D.E., Aramendía, P.F., Japas, M.L. & Fernández-Prini, R.
(1999)
. Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents. Physical Chemistry Chemical Physics, 1(21), 4955-4959.
http://dx.doi.org/10.1039/a905273i---------- CHICAGO ----------
Wetzler, D.E., Aramendía, P.F., Japas, M.L., Fernández-Prini, R.
"Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents"
. Physical Chemistry Chemical Physics 1, no. 21
(1999) : 4955-4959.
http://dx.doi.org/10.1039/a905273i---------- MLA ----------
Wetzler, D.E., Aramendía, P.F., Japas, M.L., Fernández-Prini, R.
"Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents"
. Physical Chemistry Chemical Physics, vol. 1, no. 21, 1999, pp. 4955-4959.
http://dx.doi.org/10.1039/a905273i---------- VANCOUVER ----------
Wetzler, D.E., Aramendía, P.F., Japas, M.L., Fernández-Prini, R. Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents. Phys. Chem. Chem. Phys. 1999;1(21):4955-4959.
http://dx.doi.org/10.1039/a905273i