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Titolo:
Spectroscopic study of erythrosin B in PVA films
Autore:
Stomphorst, RG; van der Zwan, G; van Zandvoort, MAMJ; Sieval, AB; Zuilhof, H; Vergeldt, FJ; Schaafsma, TJ;
Indirizzi:
Univ Wageningen & Res Ctr, Dept Biomol Sci, Mol Phys Grp, NL-6703 HA Wageningen, Netherlands Univ Wageningen & Res Ctr Wageningen Netherlands NL-6703 HA Netherlands Vrije Univ Amsterdam, Dept Analyt Chem & Appl Spect, NL-1081 HV Amsterdam,Netherlands Vrije Univ Amsterdam Amsterdam Netherlands NL-1081 HV terdam,Netherlands Univ Utrecht, Debye Inst, Dept Mol Biophys, NL-3584 CC Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3584 CC 3584 CC Utrecht, Netherlands Univ Wageningen & Res Ctr, Organ Chem Lab, NL-6703 HB Wageningen, Netherlands Univ Wageningen & Res Ctr Wageningen Netherlands NL-6703 HB Netherlands
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 17, volume: 105, anno: 2001,
pagine: 4235 - 4240
SICI:
1089-5639(20010503)105:17<4235:SSOEBI>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
AB-INITIO CALCULATIONS; CHLOROPHYLL-A; FORCE-FIELD; SYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Stomphorst, RG Univ Wageningen & Res Ctr, Dept Biomol Sci, Mol Phys Grp, Dreijenlaan 3, NL-6703 HA Wageningen, Netherlands Univ Wageningen & Res Ctr Dreijenlaan 3 Wageningen Netherlands NL-6703 HA
Citazione:
R.G. Stomphorst et al., "Spectroscopic study of erythrosin B in PVA films", J PHYS CH A, 105(17), 2001, pp. 4235-4240

Abstract

The effects of increasing concentration (10(-7)-2.5 x 10(-3) mol/g) of Erythrosin B (Ery B) in poly(vinyl alcohol) films on its visible absorption spectrum have been investigated. In a concentration range of 2 x 10(-7)-10(-5) mol/g, no effects on the absorption spectrum are found. By contrast, within this concentration range, time-resolved fluorescence experiments (fluorescence and anisotropy decay) reveal the presence of energy transfer betweenfry B molecules, followed by fluorescence at low concentrations and fluorescence quenching at higher concentrations. At a concentration of approximate to5 x 10(-5) mol/g, the absorption spectrum broadens as compared to the monomeric spectrum and fluorescence is almost completely quenched. A furtherincrease of the concentration results in a blue shift of the absorption spectrum. Using molecular mechanics calculations, it is shown that the initial broadening can be ascribed to excitonic interactions between randomly oriented molecules, whereas the blue shift at higher concentrations can be explained by the formation of oligomeric structures. At concentrations of greater than or equal to2.5 x 10(-3) mol/g, the molecules are closely packed, resulting in a contribution at the red edge of the absorption spectrum.

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Documento generato il 10/07/20 alle ore 08:56:48