EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES

A study has been made on the effect of the organic solvent upon the properties of the interface of reverse micelles formed by sodium bis (2-ethylhexyl) sulfosuccinate (AOT) - water. The study has been performed using fluorescence and absorption spectroscopies. The probes considered were 8-anilinonap...

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Autores principales:	ABUIN,E, LISSI,E, JARA,P
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2007
Materias:	AOT reverse micelles ANS- E T (30) [Ru(bpy)3]2+
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000100006
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spelling	oai:scielo:S0717-970720070001000062007-05-07EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLESABUIN,ELISSI,EJARA,P AOT reverse micelles ANS- E T (30) [Ru(bpy)3]2+ A study has been made on the effect of the organic solvent upon the properties of the interface of reverse micelles formed by sodium bis (2-ethylhexyl) sulfosuccinate (AOT) - water. The study has been performed using fluorescence and absorption spectroscopies. The probes considered were 8-anilinonaphtha lene-1-sulfonate (ANS-) and ruthenium tris [(bipyridine)]2+, [Ru (bpy)3]2+, in fluorescence spectroscopy, and E T(30) in absorption spectroscopy. These probes were selected since its spectroscopic behaviour depends on the micro polarity of the medium. Furthermore, they have equal charge (ANS-), opposite charge [Ru(bpy)3]2+ than that of the micelle, or its nature is zwitterionic (E T (30)), which allows for the sensing of the interfacial properties at different depths. The study has been performed at different W = [water]/[AOT] values ranging from ca. 1-2 up to saturation in the external solvent considered. Organic solvents employed were: n-heptane, n-hexane, isooctane, dodecane cyclohexane, benzene, toluene, cumene, chlorobenzene, dichlormethane (DCM), 1,2-dicholoroethane (1,2-DCE) and tetrachloroethylene (TCE), and the results are discussed taking n-heptane as reference solvent. For the three probes considered, n-hexane, isooctane, dodecane and cyclohexane behaves similarly to n-heptane over all the range of W values considered, irrespective of the probe employed. ANS- behaviour in benzene, toluene and TCE is similar to that observed in aliphatic hydrocarbons. Cumene, chlorobenzene, DCM and 1,2 - DCE show a microenvironment more polar than that of aliphatic hydrocarbons. The behaviour of dichloromethane and 1,2 - DCE is similar for the three probes and very different than that observed in aliphatic hydrocarbons. The microenvironment that they offer in front of [Ru(bpy)3]2+ is considerably more polar than that corresponding to n-heptane, while in front of E T(30) is less polar. The results obtained using [Ru(bpy)3]2+ are the more difficult to explain, since displacement towards more polar (in 1,2-DCE and DCM) or less polar (in benzene, cumene, TCE) media were observedinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.52 n.1 20072007-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000100006en10.4067/S0717-97072007000100006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	AOT reverse micelles ANS- E T (30) [Ru(bpy)3]2+
spellingShingle	AOT reverse micelles ANS- E T (30) [Ru(bpy)3]2+ ABUIN,E LISSI,E JARA,P EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES
description	A study has been made on the effect of the organic solvent upon the properties of the interface of reverse micelles formed by sodium bis (2-ethylhexyl) sulfosuccinate (AOT) - water. The study has been performed using fluorescence and absorption spectroscopies. The probes considered were 8-anilinonaphtha lene-1-sulfonate (ANS-) and ruthenium tris [(bipyridine)]2+, [Ru (bpy)3]2+, in fluorescence spectroscopy, and E T(30) in absorption spectroscopy. These probes were selected since its spectroscopic behaviour depends on the micro polarity of the medium. Furthermore, they have equal charge (ANS-), opposite charge [Ru(bpy)3]2+ than that of the micelle, or its nature is zwitterionic (E T (30)), which allows for the sensing of the interfacial properties at different depths. The study has been performed at different W = [water]/[AOT] values ranging from ca. 1-2 up to saturation in the external solvent considered. Organic solvents employed were: n-heptane, n-hexane, isooctane, dodecane cyclohexane, benzene, toluene, cumene, chlorobenzene, dichlormethane (DCM), 1,2-dicholoroethane (1,2-DCE) and tetrachloroethylene (TCE), and the results are discussed taking n-heptane as reference solvent. For the three probes considered, n-hexane, isooctane, dodecane and cyclohexane behaves similarly to n-heptane over all the range of W values considered, irrespective of the probe employed. ANS- behaviour in benzene, toluene and TCE is similar to that observed in aliphatic hydrocarbons. Cumene, chlorobenzene, DCM and 1,2 - DCE show a microenvironment more polar than that of aliphatic hydrocarbons. The behaviour of dichloromethane and 1,2 - DCE is similar for the three probes and very different than that observed in aliphatic hydrocarbons. The microenvironment that they offer in front of [Ru(bpy)3]2+ is considerably more polar than that corresponding to n-heptane, while in front of E T(30) is less polar. The results obtained using [Ru(bpy)3]2+ are the more difficult to explain, since displacement towards more polar (in 1,2-DCE and DCM) or less polar (in benzene, cumene, TCE) media were observed
author	ABUIN,E LISSI,E JARA,P
author_facet	ABUIN,E LISSI,E JARA,P
author_sort	ABUIN,E
title	EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES
title_short	EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES
title_full	EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES
title_fullStr	EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES
title_full_unstemmed	EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES
title_sort	effect of the organic solvent on the interfacial micropolarity of aot -water reverse micelles
publisher	Sociedad Chilena de Química
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000100006
work_keys_str_mv	AT abuine effectoftheorganicsolventontheinterfacialmicropolarityofaotwaterreversemicelles AT lissie effectoftheorganicsolventontheinterfacialmicropolarityofaotwaterreversemicelles AT jarap effectoftheorganicsolventontheinterfacialmicropolarityofaotwaterreversemicelles
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EFFECT OF THE ORGANIC SOLVENT ON THE INTERFACIAL MICROPOLARITY OF AOT -WATER REVERSE MICELLES

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