Artículo

Rodríguez, H.B.; Mirenda, M.; Lagorio, M.G.; San Román, E. "Photophysics at Unusually High Dye Concentrations" (2019) Accounts of Chemical Research. 52(1):110-118
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Abstract:

ConspectusThe study of the interaction of light with systems at high dye concentrations implies a great challenge because several factors, such as emission reabsorption, dye aggregation, and energy trapping, hinder rationalization and interpretation of the involved photophysical processes. Space constraints induce dye interaction even in the absence of ground state stabilization of dimers and oligomers. At distances on the order of 1 nm, statistical energy traps are usually observed. At longer distances, excited state energy transfer takes place. Most of these factors do not result in ground state spectroscopic changes. Rather, fluorescence phenomena such as inner filter effects, concentration-dependent Stokes' shifts, and changes in quantum yields and decay times are evidenced.Photophysical studies are commonly carried out at high dilution, to minimize dye-dye interactions and emission reabsorption, and in the absence of light scattering. Under these conditions, the physical description of the system becomes rather simple. Fluorescence and triplet quantum yields become molecular properties and can be easily related to ratios of rate constants. However, many systems containing dyes able to fulfill specific functions, whether man-made or biological, are far from being dilute and scattering-free. The photosynthetic apparatus is a paradigmatic example. It is clear that isolation of components allows gathering relevant information about complex systems. However, knowledge of the photophysical behavior in the unaltered environment is essential in most cases.Complexity generally increases when light scattering is present. Despite that, our experience shows that light scattering, when correctly handled, may even simplify the task of unraveling molecular parameters. We show that methods and models aiming at the determination and interpretation of fluorescence and triplet quantum yields as well as energy transfer efficiencies can be developed on the basis of simple light-scattering theories.Photophysical studies were extended to thin films and layer-by-layer assemblies. Procedures are presented for the evaluation of fluorescence reabsorption in concentrated fluid solutions up to the molar level, which are being applied to ionic liquids, in which the emitting species are the bulk ions. Fluorescence reabsorption models proved to be useful in the interpretation of the photophysics of living organisms such as plant leaves and fruits. These new tools allowed the assessment of chlorophyll fluorescence at the chloroplast, leaf and canopy levels, with implications in remote sensing and the development of nondestructive optical methods. © 2018 American Chemical Society.

Registro:

Documento: Artículo
Título:Photophysics at Unusually High Dye Concentrations
Autor:Rodríguez, H.B.; Mirenda, M.; Lagorio, M.G.; San Román, E.
Filiación:Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Facultad de Ciencias Exactas, Universidad Nacional de la Plata, Diagonal 113 y 64 S/N, La Plata, B1904DPI, Argentina
Gerencia Química, Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica, Av. Gral. Paz 1499, San Martín, Buenos Aires, B1650KNA, Argentina
CONICET - Universidad de Buenos Aires, Instituto de Química Física de Los Materiales, Medio Ambiente y Energía, Ciudad Universitaria Pab. II, Buenos Aires, C1428EHA, Argentina
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Química Inorgánica, Analítica y Química Física, Ciudad Universitaria, Pab. II, Buenos Aires, C1428EHA, Argentina
Año:2019
Volumen:52
Número:1
Página de inicio:110
Página de fin:118
DOI: http://dx.doi.org/10.1021/acs.accounts.8b00271
Título revista:Accounts of Chemical Research
Título revista abreviado:Acc. Chem. Res.
ISSN:00014842
CODEN:ACHRE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00014842_v52_n1_p110_Rodriguez

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Citas:

---------- APA ----------
Rodríguez, H.B., Mirenda, M., Lagorio, M.G. & San Román, E. (2019) . Photophysics at Unusually High Dye Concentrations. Accounts of Chemical Research, 52(1), 110-118.
http://dx.doi.org/10.1021/acs.accounts.8b00271
---------- CHICAGO ----------
Rodríguez, H.B., Mirenda, M., Lagorio, M.G., San Román, E. "Photophysics at Unusually High Dye Concentrations" . Accounts of Chemical Research 52, no. 1 (2019) : 110-118.
http://dx.doi.org/10.1021/acs.accounts.8b00271
---------- MLA ----------
Rodríguez, H.B., Mirenda, M., Lagorio, M.G., San Román, E. "Photophysics at Unusually High Dye Concentrations" . Accounts of Chemical Research, vol. 52, no. 1, 2019, pp. 110-118.
http://dx.doi.org/10.1021/acs.accounts.8b00271
---------- VANCOUVER ----------
Rodríguez, H.B., Mirenda, M., Lagorio, M.G., San Román, E. Photophysics at Unusually High Dye Concentrations. Acc. Chem. Res. 2019;52(1):110-118.
http://dx.doi.org/10.1021/acs.accounts.8b00271