Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents

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...

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Detalles Bibliográficos
Autores principales:	Wetzler, D.E., Aramendía, P.F., Japas, M.L., Fernández-Prini, R.
Formato:	JOUR
Materias:	acetonitrile alcohol benzene derivative hexane merocyanine nitrogen derivative pyran derivative solvent toluene article chemical reaction kinetics chemical structure controlled study enthalpy photochemistry spectroscopy
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_14639076_v1_n21_p4955_Wetzler
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_14639076_v1_n21_p4955_Wetzler
record_format	dspace
spelling	todo:paper_14639076_v1_n21_p4955_Wetzler2023-10-03T16:16:56Z Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents Wetzler, D.E. Aramendía, P.F. Japas, M.L. Fernández-Prini, R. acetonitrile alcohol benzene derivative hexane merocyanine nitrogen derivative pyran derivative solvent toluene article chemical reaction kinetics chemical structure controlled study enthalpy photochemistry spectroscopy 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≠. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14639076_v1_n21_p4955_Wetzler
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	acetonitrile alcohol benzene derivative hexane merocyanine nitrogen derivative pyran derivative solvent toluene article chemical reaction kinetics chemical structure controlled study enthalpy photochemistry spectroscopy
spellingShingle	acetonitrile alcohol benzene derivative hexane merocyanine nitrogen derivative pyran derivative solvent toluene article chemical reaction kinetics chemical structure controlled study enthalpy photochemistry spectroscopy 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
topic_facet	acetonitrile alcohol benzene derivative hexane merocyanine nitrogen derivative pyran derivative solvent toluene article chemical reaction kinetics chemical structure controlled study enthalpy photochemistry spectroscopy
description	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≠.
format	JOUR
author	Wetzler, D.E. Aramendía, P.F. Japas, M.L. Fernández-Prini, R.
author_facet	Wetzler, D.E. Aramendía, P.F. Japas, M.L. Fernández-Prini, R.
author_sort	Wetzler, D.E.
title	Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents
title_short	Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents
title_full	Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents
title_fullStr	Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents
title_full_unstemmed	Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents
title_sort	spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents
url	http://hdl.handle.net/20.500.12110/paper_14639076_v1_n21_p4955_Wetzler
work_keys_str_mv	AT wetzlerde spectroscopyandthermaldecayofaphotomerocyanineinmixturesofpolarandnonpolarsolvents AT aramendiapf spectroscopyandthermaldecayofaphotomerocyanineinmixturesofpolarandnonpolarsolvents AT japasml spectroscopyandthermaldecayofaphotomerocyanineinmixturesofpolarandnonpolarsolvents AT fernandezprinir spectroscopyandthermaldecayofaphotomerocyanineinmixturesofpolarandnonpolarsolvents
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Spectroscopy and thermal decay of a photomerocyanine in mixtures of polar and nonpolar solvents

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