SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES

Here we present an investigation of the quenching of anthracene triplet by several p-benzoquinones, in two solvents of nearly equal macroscopic dielectric properties, methanol and acetonitrile. Bimolecular quenching rate constants were measured by laser flash photolysis. Quantum efficiencies of char...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Zanini,Graciela P., Montejano,Hernan A.
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2001
Materias:	electron transfer solvent effects anthracene quinones quenching
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000100013
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0366-16442001000100013
record_format	dspace
spelling	oai:scielo:S0366-164420010001000132001-05-30SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONESZanini,Graciela P.Montejano,Hernan A. electron transfer solvent effects anthracene quinones quenching Here we present an investigation of the quenching of anthracene triplet by several p-benzoquinones, in two solvents of nearly equal macroscopic dielectric properties, methanol and acetonitrile. Bimolecular quenching rate constants were measured by laser flash photolysis. Quantum efficiencies of charge separation were also determined in the protic solvent. Quenching rate constants in acetonitrile follow a typical Rehm-Weller correlation for an electron transfer process. Although free radical ions are observed in methanol, the rate constants are nearly independent on the driving force, at variance of the expected behavior. In this solvent, the charge separation quantum yield decreases when the energy of the ion-pair decreases, in agreement with the energy gap lawinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaBoletín de la Sociedad Chilena de Química v.46 n.1 20012001-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000100013en10.4067/S0366-16442001000100013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	electron transfer solvent effects anthracene quinones quenching
spellingShingle	electron transfer solvent effects anthracene quinones quenching Zanini,Graciela P. Montejano,Hernan A. SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES
description	Here we present an investigation of the quenching of anthracene triplet by several p-benzoquinones, in two solvents of nearly equal macroscopic dielectric properties, methanol and acetonitrile. Bimolecular quenching rate constants were measured by laser flash photolysis. Quantum efficiencies of charge separation were also determined in the protic solvent. Quenching rate constants in acetonitrile follow a typical Rehm-Weller correlation for an electron transfer process. Although free radical ions are observed in methanol, the rate constants are nearly independent on the driving force, at variance of the expected behavior. In this solvent, the charge separation quantum yield decreases when the energy of the ion-pair decreases, in agreement with the energy gap law
author	Zanini,Graciela P. Montejano,Hernan A.
author_facet	Zanini,Graciela P. Montejano,Hernan A.
author_sort	Zanini,Graciela P.
title	SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES
title_short	SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES
title_full	SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES
title_fullStr	SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES
title_full_unstemmed	SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES
title_sort	solvent effects in the electron transfer quenching of the triplet state of anthracene by p-benzoquinones
publisher	Sociedad Chilena de Química
publishDate	2001
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000100013
work_keys_str_mv	AT zaninigracielap solventeffectsintheelectrontransferquenchingofthetripletstateofanthracenebypbenzoquinones AT montejanohernana solventeffectsintheelectrontransferquenchingofthetripletstateofanthracenebypbenzoquinones
_version_	1718438125127073792

SOLVENT EFFECTS IN THE ELECTRON TRANSFER QUENCHING OF THE TRIPLET STATE OF ANTHRACENE BY p-BENZOQUINONES

Ejemplares similares