INVESTIGADORES
LAGORIO MarÍa Gabriela
artículos
Título:
Rose Bengal adsorbed on microgranular cellulose: evidence on fluorescent dimers
Autor/es:
HERNÁN B. RODRIGUEZ, M. GABRIELA LAGORIO AND ENRIQUE SAN ROM¨¢N
Revista:
Photochemical and Photobiological Sciences
Editorial:
RSCPublishing
Referencias:
Lugar: Cambridge; Año: 2004 p. 674 - 680
ISSN:
1474-905X
Resumen:
Rose Bengal adsorbed on microgranular cellulose was studied in the solid phase by total and di.use re.ectance and
steady-state emission spectroscopy. A simple monomer¨Cdimer equilibrium .tted re.ectance data up to dye loadings
of 4 ¡Á 107 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 Rom¨¢n,
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 Rom¨¢n,
of 4 ¡Á 107 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 Rom¨¢n,
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 Rom¨¢n,
steady-state emission spectroscopy. A simple monomer¨Cdimer equilibrium .tted re.ectance data up to dye loadings
of 4 ¡Á 107 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 Rom¨¢n,
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 Rom¨¢n,
of 4 ¡Á 107 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 Rom¨¢n,
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 Rom¨¢n,
.use re.ectance and
steady-state emission spectroscopy. A simple monomer¨Cdimer equilibrium .tted re.ectance data up to dye loadings
of 4 ¡Á 107 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 Rom¨¢n,
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 Rom¨¢n,
of 4 ¡Á 107 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 Rom¨¢n,
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 Rom¨¢n,
.tted re.ectance data up to dye loadings
of 4 ¡Á 107 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 Rom¨¢n,
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 Rom¨¢n,
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 Rom¨¢n,
J. Chem. Soc., Faraday Trans., 1998, 94, 419]. An apparent increase of .uorescence quantum yield with dye loading
was found, which was attributed to the occurrence of dimer .uorescence. Extension of the model to two luminescent
species (i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
species (i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
was found, which was attributed to the occurrence of dimer .uorescence. Extension of the model to two luminescent
species (i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
species (i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
was found, which was attributed to the occurrence of dimer .uorescence. Extension of the model to two luminescent
species (i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
species (i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
.uorescence. Extension of the model to two luminescent
species (i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
i.e. monomer and dimer) yielded constant .uorescence quantum yields for the monomer, ¦µM=0.120 ¡À 0.004,
and for the dimer, ¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
¦µD=0.070 ¡À 0.006. The monomer quantum yield is close to the value found for the same dye in
basic ethanol. The presence of .uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed.
excitation spectra and other experimental evidence. The possible occurrence of non-radiative energy transfer and
the e.ect of surface charge on the properties of the dimer are analyzed.
.uorescent 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 e.ect of surface charge on the properties of the dimer are analyzed..ect of surface charge on the properties of the dimer are analyzed.
, 1998, 94, 419]. An apparent increase of .uorescence quantum yield with dye loading
