Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles

Rhodamine 101 (R101) was chemically attached onto microcrystalline cellulose and methylene blue (MB) was adsorbed to a sample bearing nearby 6 × 10-7 mol R101 (g cellulose)-1. The system was studied by reflectance and emission spectroscopy in the solid state. R101 shows no aggregation in these condi...

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Autores principales: Rodríguez, H.B., Román, E.S.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00318655_v83_n3_p547_Rodriguez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00318655_v83_n3_p547_Rodriguez2023-10-03T14:41:36Z Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles Rodríguez, H.B. Román, E.S. Rhodamine 101 (R101) was chemically attached onto microcrystalline cellulose and methylene blue (MB) was adsorbed to a sample bearing nearby 6 × 10-7 mol R101 (g cellulose)-1. The system was studied by reflectance and emission spectroscopy in the solid state. R101 shows no aggregation in these conditions and, while pure MB builds up dimers on cellulose even at 2 × 10-8 mol g-1, in the presence of R101 no evidence on selfaggregation or heteroaggregation is found up to around 10-6 mol g-1. No exciplex formation is found as well. The overall fluorescence quantum yield measured on thick layers, once re-absorption effects are accounted for, amounts to 0.80 ± 0.07 for pure R101 and decreases steadily on increasing the concentration of MB. Results demonstrate the occurrence of radiative and nonradiative singlet energy transfer from R101 to MB. For thick layers of particles, the combined effect of both kinds of energy transfer amounts to nearly 80% at the highest acceptor concentration, while nonradiative transfer reaches 60% both for thin and optically thick layers. The dependence of nonradiative energy transfer efficiencies on the acceptor concentration is analyzed and the origin of departures from Förster behavior at low acceptor concentration is discussed. © 2007 American Society for Photobiology. Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00318655_v83_n3_p547_Rodriguez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Rhodamine 101 (R101) was chemically attached onto microcrystalline cellulose and methylene blue (MB) was adsorbed to a sample bearing nearby 6 × 10-7 mol R101 (g cellulose)-1. The system was studied by reflectance and emission spectroscopy in the solid state. R101 shows no aggregation in these conditions and, while pure MB builds up dimers on cellulose even at 2 × 10-8 mol g-1, in the presence of R101 no evidence on selfaggregation or heteroaggregation is found up to around 10-6 mol g-1. No exciplex formation is found as well. The overall fluorescence quantum yield measured on thick layers, once re-absorption effects are accounted for, amounts to 0.80 ± 0.07 for pure R101 and decreases steadily on increasing the concentration of MB. Results demonstrate the occurrence of radiative and nonradiative singlet energy transfer from R101 to MB. For thick layers of particles, the combined effect of both kinds of energy transfer amounts to nearly 80% at the highest acceptor concentration, while nonradiative transfer reaches 60% both for thin and optically thick layers. The dependence of nonradiative energy transfer efficiencies on the acceptor concentration is analyzed and the origin of departures from Förster behavior at low acceptor concentration is discussed. © 2007 American Society for Photobiology.
format JOUR
author Rodríguez, H.B.
Román, E.S.
spellingShingle Rodríguez, H.B.
Román, E.S.
Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles
author_facet Rodríguez, H.B.
Román, E.S.
author_sort Rodríguez, H.B.
title Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles
title_short Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles
title_full Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles
title_fullStr Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles
title_full_unstemmed Energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles
title_sort energy transfer from chemically attached rhodamine 101 to adsorbed methylene blue on microcrystalline cellulose particles
url http://hdl.handle.net/20.500.12110/paper_00318655_v83_n3_p547_Rodriguez
work_keys_str_mv AT rodriguezhb energytransferfromchemicallyattachedrhodamine101toadsorbedmethyleneblueonmicrocrystallinecelluloseparticles
AT romanes energytransferfromchemicallyattachedrhodamine101toadsorbedmethyleneblueonmicrocrystallinecelluloseparticles
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