Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers

Rose Bengal adsorbed on microgranular cellulose was studied in the solid phase by total and diffuse reflectance and steady-state emission spectroscopy. A simple monomer-dimer equilibrium fitted reflectance data up to dye loadings of 4 × 10-7 mol (g cellulose)-1 and allowed calculation of monomer and...

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Autores principales: Rodríguez, H.B., Lagorio, M.G., San Román, E.
Formato: JOUR
Materias:
alcohol
cellulose
dimer
monomer
rose bengal
acid base balance
adsorption kinetics
article
controlled study
diffuse reflectance spectroscopy
dimerization
drug adsorption
drug determination
energy transfer
flame photometry
fluorescence spectroscopy
luminescence
mathematical model
observation
photochemistry
photosensitization
physical chemistry
priority journal
quantum chemistry
quantum yield
solid state
steady state
surface charge
Roman
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1474905X_v3_n7_p674_Rodriguez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_1474905X_v3_n7_p674_Rodriguez
record_format dspace
spelling todo:paper_1474905X_v3_n7_p674_Rodriguez2023-10-03T16:18:27Z Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers Rodríguez, H.B. Lagorio, M.G. San Román, E. alcohol cellulose dimer monomer rose bengal acid base balance adsorption kinetics article controlled study diffuse reflectance spectroscopy dimerization drug adsorption drug determination energy transfer flame photometry fluorescence spectroscopy luminescence mathematical model observation photochemistry photosensitization physical chemistry priority journal quantum chemistry quantum yield solid state steady state surface charge Roman Rose Bengal adsorbed on microgranular cellulose was studied in the solid phase by total and diffuse reflectance and steady-state emission spectroscopy. A simple monomer-dimer equilibrium fitted reflectance data up to dye loadings of 4 × 10-7 mol (g cellulose)-1 and allowed calculation of monomer and dimer spectra. Further increase of dye loading resulted in the formation of higher aggregates. Observed emission and excitation spectra and quantum yields were corrected for reabsorption and reemission of luminescence, using a previously developed model, within the assumption that only monomers are luminescent [M. G. Lagorio, L. E. Dicelio, M. I. Litter and E. San Román, J. Chem. Soc, Faraday Trans., 1998, 94, 419]. An apparent increase of fluorescence quantum yield with dye loading was found, which was attributed to the occurrence of dimer fluorescence. Extension of the model to two luminescent species (i.e. monomer and dimer) yielded constant fluorescence quantum yields for the monomer, ΦM = 0.120 ± 0.004, and for the dimer, ΦD = 0.070 ± 0.006. The monomer quantum yield is close to the value found for the same dye in basic ethanol. The presence of fluorescent dimers and calculated quantum yields are supported by analysis of the excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and the effect of surface charge on the properties of the dimer are analyzed. © The Royal Society of Chemistry and Owner Societies 2004. Fil:Rodríguez, H.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lagorio, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:San Román, E. 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_1474905X_v3_n7_p674_Rodriguez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic alcohol
cellulose
dimer
monomer
rose bengal
acid base balance
adsorption kinetics
article
controlled study
diffuse reflectance spectroscopy
dimerization
drug adsorption
drug determination
energy transfer
flame photometry
fluorescence spectroscopy
luminescence
mathematical model
observation
photochemistry
photosensitization
physical chemistry
priority journal
quantum chemistry
quantum yield
solid state
steady state
surface charge
Roman
spellingShingle alcohol
cellulose
dimer
monomer
rose bengal
acid base balance
adsorption kinetics
article
controlled study
diffuse reflectance spectroscopy
dimerization
drug adsorption
drug determination
energy transfer
flame photometry
fluorescence spectroscopy
luminescence
mathematical model
observation
photochemistry
photosensitization
physical chemistry
priority journal
quantum chemistry
quantum yield
solid state
steady state
surface charge
Roman
Rodríguez, H.B.
Lagorio, M.G.
San Román, E.
Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers
topic_facet alcohol
cellulose
dimer
monomer
rose bengal
acid base balance
adsorption kinetics
article
controlled study
diffuse reflectance spectroscopy
dimerization
drug adsorption
drug determination
energy transfer
flame photometry
fluorescence spectroscopy
luminescence
mathematical model
observation
photochemistry
photosensitization
physical chemistry
priority journal
quantum chemistry
quantum yield
solid state
steady state
surface charge
Roman
description Rose Bengal adsorbed on microgranular cellulose was studied in the solid phase by total and diffuse reflectance and steady-state emission spectroscopy. A simple monomer-dimer equilibrium fitted reflectance data up to dye loadings of 4 × 10-7 mol (g cellulose)-1 and allowed calculation of monomer and dimer spectra. Further increase of dye loading resulted in the formation of higher aggregates. Observed emission and excitation spectra and quantum yields were corrected for reabsorption and reemission of luminescence, using a previously developed model, within the assumption that only monomers are luminescent [M. G. Lagorio, L. E. Dicelio, M. I. Litter and E. San Román, J. Chem. Soc, Faraday Trans., 1998, 94, 419]. An apparent increase of fluorescence quantum yield with dye loading was found, which was attributed to the occurrence of dimer fluorescence. Extension of the model to two luminescent species (i.e. monomer and dimer) yielded constant fluorescence quantum yields for the monomer, ΦM = 0.120 ± 0.004, and for the dimer, ΦD = 0.070 ± 0.006. The monomer quantum yield is close to the value found for the same dye in basic ethanol. The presence of fluorescent dimers and calculated quantum yields are supported by analysis of the excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and the effect of surface charge on the properties of the dimer are analyzed. © The Royal Society of Chemistry and Owner Societies 2004.
format JOUR
author Rodríguez, H.B.
Lagorio, M.G.
San Román, E.
author_facet Rodríguez, H.B.
Lagorio, M.G.
San Román, E.
author_sort Rodríguez, H.B.
title Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers
title_short Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers
title_full Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers
title_fullStr Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers
title_full_unstemmed Rose Bengal adsorbed on microgranular cellulose: Evidence on fluorescent dimers
title_sort rose bengal adsorbed on microgranular cellulose: evidence on fluorescent dimers
url http://hdl.handle.net/20.500.12110/paper_1474905X_v3_n7_p674_Rodriguez
work_keys_str_mv AT rodriguezhb rosebengaladsorbedonmicrogranularcelluloseevidenceonfluorescentdimers
AT lagoriomg rosebengaladsorbedonmicrogranularcelluloseevidenceonfluorescentdimers
AT sanromane rosebengaladsorbedonmicrogranularcelluloseevidenceonfluorescentdimers
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