INVESTIGADORES
FROIMOWICZ Pablo
artículos
Título:
Determination of the Fo¨rster Distance in Polymer Films by Fluorescence Decay for Donor Dyes with a Nonexponential Decay Profile
Autor/es:
NEDA FELORZABIHI; PABLO FROIMOWICZ; JEFFREY C HALEY; GHASEM REZANEJAD BARDAJEE; BINXIN LI; ENRICO BOVERO; FRANK CJM VAN VEGGEL; MITCHELL A WINNIK
Revista:
JOURNAL OF PHYSICAL CHEMISTRY B - (Print)
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2009 p. 2262 - 2272
ISSN:
1520-6106
Resumen:
Fluorescence resonance energy transfer (FRET) experiments were carried
out on three pairs of donor−acceptor dyes in polymer films in which the
donor dyes had absorption maxima in the range of 350−450 nm. Two of the
donors, a coumarin dye and a naphthalimide dye covalently bound to
polystyrene, gave nonexponential decays in the absence of acceptors. The
decay profiles could be fitted to a stretched exponential form with a β
value on the order of 0.9. We developed equations for analyzing donor
fluorescence intensity decay profiles for donor−acceptor mixtures in
rigid matrices for the case of donors showing relatively small
deviations from exponentiality. To test these equations, we calculate
values of the Förster radius (R0FR) from the decay profile data and compare these values to the Förster radius R0SO
determined by the traditional spectral overlap method. Agreement
between these values validates the methodology developed here for the
use of such donor dyes in FRET studies of more complex polymer systems.