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Abstract:

Solutions and layer-by-layer self-assembled thin films containing Rose Bengal and poly(diallyldimethylammonium chloride) are studied with the aim of understanding the interactions controlling their structures and the photophysics of the dye in both media. A detailed spectroscopic and theoretical analysis shows that hydrophobic interactions among dye molecules contribute to the coiling of the polyelectrolyte chain in solution at low polyelectroiyte/dye (PID) ratios, whereas extensive aggregation of the dye takes place even at ratios as high as 104 (expressed in monomeric units). A polyelectrolyte elongated form prevails in self-assembled thin films, providing an environment that reduces hydrophobic interactions and lowers the aggregation tendency. Self-assembled films with a roughly estimated overall dye concentration around 1 M at a PID ratio in the order of seven are fluorescent and photogenerate singlet molecular oxygen. This contrasts with the behavior of polyelectrolyte solutions, which are almost nonfluorescent and do not evidence triplet state generation at the same PID ratio. © 2008 American Chemical Society.

Registro:

Documento: Artículo
Título:Effect of molecular interactions on the photophysics of Rose Bengal in polyelectrolyte solutions and self-assembled thin films
Autor:Mirenda, M.; Dicelio, L.E.; Román, E.S.
Filiación:INQUIMAE/DQIAyQF, Facultad de Ciencias Exactas y Naturales, Pabellón 2, C1428EHA, Buenos Aires, Argentina
Palabras clave:Agglomeration; Concentration (process); Dyes; Electric network analysis; Flow interactions; Hydrophobicity; Oxygen; Polyelectrolytes; Polymers; Proportional control systems; Solutions; Spectroscopic analysis; Thick films; Thin films; Dye concentrations; Dye molecules; Hydrophobic interactions; Layer-by-layer; Monomeric units; Photophysics; Poly(diallyldimethylammonium chloride); Poly-electrolyte; Polyelectrolyte chains; Polyelectrolyte solutions; Rose bengal; Singlet molecular oxygens; Theoretical analyses; Triplet states; Molecular oxygen
Año:2008
Volumen:112
Número:39
Página de inicio:12201
Página de fin:12207
DOI: http://dx.doi.org/10.1021/jp803892g
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_v112_n39_p12201_Mirenda

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Citas:

---------- APA ----------
Mirenda, M., Dicelio, L.E. & Román, E.S. (2008) . Effect of molecular interactions on the photophysics of Rose Bengal in polyelectrolyte solutions and self-assembled thin films. Journal of Physical Chemistry B, 112(39), 12201-12207.
http://dx.doi.org/10.1021/jp803892g
---------- CHICAGO ----------
Mirenda, M., Dicelio, L.E., Román, E.S. "Effect of molecular interactions on the photophysics of Rose Bengal in polyelectrolyte solutions and self-assembled thin films" . Journal of Physical Chemistry B 112, no. 39 (2008) : 12201-12207.
http://dx.doi.org/10.1021/jp803892g
---------- MLA ----------
Mirenda, M., Dicelio, L.E., Román, E.S. "Effect of molecular interactions on the photophysics of Rose Bengal in polyelectrolyte solutions and self-assembled thin films" . Journal of Physical Chemistry B, vol. 112, no. 39, 2008, pp. 12201-12207.
http://dx.doi.org/10.1021/jp803892g
---------- VANCOUVER ----------
Mirenda, M., Dicelio, L.E., Román, E.S. Effect of molecular interactions on the photophysics of Rose Bengal in polyelectrolyte solutions and self-assembled thin films. J Phys Chem B. 2008;112(39):12201-12207.
http://dx.doi.org/10.1021/jp803892g