Artículos de revistas
Exciton Splitting Of Fluorescein Disodium In Polyethylene Glycol 600
Registro en:
Journal Of Photochemistry And Photobiology, A: Chemistry. , v. 59, n. 1, p. 123 - 130, 1991.
10106030
10.1016/1010-6030(91)87076-8
2-s2.0-0011444599
Autor
Bortolato C.A.
Atvars T.D.Z.
Dibbern-Brunelli D.
Institución
Resumen
The absorption and emission spectra of fluorescein disodium at various concentrations and temperatures were studied using polyethylene glycol 600 as solvent. From the results obtained, it can be concluded that the geometry of the aggregate changes with the physical state of the solvent: the geometry at low temperatures (polymer in the glass state) involves two molecules of the dye in a sandwich orientation; the geometry in the liquid state involves a linear configuration of the monomers. The exciton splitting of the energy levels of the aggregate in the sandwich orientation can be obtained from the fluorescence spectra as 1180 cm-1. The dependence of the fluorescence spectra on the temperature enables the changes in the geometry of the aggregates and the relaxation temperatures of the polymer chains to be investigated. © 1991. 59 1 123 130 Birks, (1960) Photophysics of Aromatic Molecules, , Wiley-Interscience, New York Pant, Pant, (1968) Indian J. Pure Appl. Phys., 6, p. 238 Pant, Bhagghandani, Pant, Verna, (1971) Chem. Phys. Lett., 9, p. 546 Rohatgi, Mukhopalhyay, (1972) J. Phys. Chem., 76, p. 3970 Arbeloa, Flourescence quantum yield evaluation: corrections for re-absorption and re-emission (1980) Journal of Photochemistry, 14, p. 97 Arbeloa, Flourescence self-quenching of Halofluorescein dyes (1982) Journal of Photochemistry, 18, p. 161 Arbeloa, (1981) J. Chem. Soc., Faraday Trans. 2, 77, p. 1725 Arbeloa, (1981) J. Chem. Soc., Faraday Trans. 2, 77, p. 1735 Pant, Bhagghandani, Pant, Verna, (1971) Indian J. Pure Appl. Phys., 9, p. 824 Rohatgi, (1968) J. Mol. Spectrosc., 27, p. 545 Kasha, Rawls, El-Bayoumi, The exciton model in molecular spectroscopy (1965) Pure and Applied Chemistry, 11, p. 371 Lang, Noel, Legrand, (1977) J. Polym. Sci., 15, p. 1319. , Polym. Phys. Ed Lang, Noel, Legrand, (1977) J. Polym. Sci., 15, p. 1329. , Polym. Phys. Ed Sabadini, Atvars, (1989) Quim. Nova, 12 (4), p. 318 Atvars, Sabadini, (1988) Acta Simposio Latinoamericano de Polimeros (Venezuela), 1, p. 1021 Faraggi, Peretz, Rosenthal, Weinraub, (1984) Chem. Phys. Lett., 103, p. 310 Ojeda, Amashta, Ochoa, Arbeloa, (1988) J. Chem. Soc., Faraday Trans. 2, 84, p. 1 Arbeloa, Arbeloa, Influence of the molecular structure and the nature of the solvent on the absorption and fluorescence characteristics of rhodamines (1989) Chemical Physics, 103, p. 371 Arbeloa, Ojeda, Arbeloa, (1988) Chem. Phys. Lett., 148, p. 253 Aguilera, Neckers, Aggregation phenomena in xanthene dyes (1989) Accounts of Chemical Research, 22, p. 171 Martin, Pardo, Guijarro, Fernandez-Alonso, (1986) J. Mol. Struct, 142, p. 187 Lofty, (1985) Photophysical and Photochemical Tools in Polymer Science, Conformation, Dynamics and Morphology, 182, p. 429. , M.A. Winnik, NATO ASI Series Guillet, (1985) Photophysical and Photochemical Toals in Polymer Science, Conformation, Dynamics and Morphology, 182, p. 467. , M.A. Winnik, NATO ASI Series