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Abstract:

The effect of near-criticality upon the properties of dilute solutions of attractive solutes has been previously studied only using pure solvents close to the vapor-liquid critical point. The experimental difficulties that plague this thermodynamic region have somewhat obscured the interpretations of the results. Consequently, the coupling of long-range critical fluctuations with short-range intermolecular interactions is still a matter of debate. We developed a new strategy consisting of studying the changes in the solvation shell of probe molecules dissolved in a binary solvent mixture close to its lower consolute critical point. The study is based on UV-vis absorption and fluorescent emission measurements of the solvatochromic and thermochromic effects of two dyes, Reichardt's Dye and Nile Red, dissolved in mixtures of lutidine-water. The results show unambiguously the existence of a subtle change in the composition of the near-critical solvent surrounding the probe molecules with respect to the bulk composition, thus we conclude that the coupling of long-range fluctuations with short-range interactions is now firmly established. © 2011 American Chemical Society.

Registro:

Documento: Artículo
Título:Critical effects on attractive solutes in binary liquid mixtures close to their consolute point: A new experimental strategy
Autor:Gutkowski, K.I.; Fernández-Prini, R.; Aramendía, P.F.; Japas, M.L.
Filiación:Gerencia Química, CAC, Comisión Nacional de Energía Atómica, Avenida Libertador 8250, 1429-Buenos Aires, Argentina
INQUIMAE/DQIAQF, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428-Buenos Aires, Argentina
Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín, Martín de Irigoyen 3100, 1650-San Martín, Provincia Buenos Aires, Argentina
Palabras clave:Liquids; Probes; Solvents; Water absorption; Binary solvent mixtures; Binary-liquid mixtures; Bulk compositions; Consolute points; Critical effects; Critical fluctuations; Critical points; Dilute solution; Experimental strategy; Fluorescent emission; Intermolecular interactions; New strategy; Nile Red; Probe molecules; Pure solvents; Reichardt's dye; Short range interactions; Solvation shell; Solvatochromic; Thermochromic effects; UV-vis absorptions; Vapor-liquid; Binary mixtures
Año:2011
Volumen:115
Número:51
Página de inicio:15303
Página de fin:15312
DOI: http://dx.doi.org/10.1021/jp209007y
Título revista:Journal of Physical Chemistry B
Título revista abreviado:J Phys Chem B
ISSN:15206106
CODEN:JPCBF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v115_n51_p15303_Gutkowski

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Citas:

---------- APA ----------
Gutkowski, K.I., Fernández-Prini, R., Aramendía, P.F. & Japas, M.L. (2011) . Critical effects on attractive solutes in binary liquid mixtures close to their consolute point: A new experimental strategy. Journal of Physical Chemistry B, 115(51), 15303-15312.
http://dx.doi.org/10.1021/jp209007y
---------- CHICAGO ----------
Gutkowski, K.I., Fernández-Prini, R., Aramendía, P.F., Japas, M.L. "Critical effects on attractive solutes in binary liquid mixtures close to their consolute point: A new experimental strategy" . Journal of Physical Chemistry B 115, no. 51 (2011) : 15303-15312.
http://dx.doi.org/10.1021/jp209007y
---------- MLA ----------
Gutkowski, K.I., Fernández-Prini, R., Aramendía, P.F., Japas, M.L. "Critical effects on attractive solutes in binary liquid mixtures close to their consolute point: A new experimental strategy" . Journal of Physical Chemistry B, vol. 115, no. 51, 2011, pp. 15303-15312.
http://dx.doi.org/10.1021/jp209007y
---------- VANCOUVER ----------
Gutkowski, K.I., Fernández-Prini, R., Aramendía, P.F., Japas, M.L. Critical effects on attractive solutes in binary liquid mixtures close to their consolute point: A new experimental strategy. J Phys Chem B. 2011;115(51):15303-15312.
http://dx.doi.org/10.1021/jp209007y