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Titolo:
Fluorescence decay study of anisotropic rotations of substituted pyrenes physisorbed and chemically attached to a fumed silica surface
Autore:
Ivanov, IN; Dabestani, R; Buchanan, AC; Sigman, ME;
Indirizzi:
Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA Oak Ridge Natl Lab Oak Ridge TN USA 37831 yt Sci, Oak Ridge, TN 37831 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 42, volume: 105, anno: 2001,
pagine: 10308 - 10315
SICI:
1520-6106(20011025)105:42<10308:FDSOAR>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOLUTE-SOLVENT INTERACTION; ENVIRONMENTAL PHOTOCHEMISTRY; PHOTOSENSITIZED DEGRADATION; PHOTOCATALYTIC DEGRADATION; MOLECULAR ASSOCIATION; SOLVATION DYNAMICS; DRY SILICA; GEL; WATER; MECHANISM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Dabestani, R Oak Ridge Natl Lab, Div Chem & Analyt Sci, POB 2008,MS-6100, Oak Ridge, TN37831 USA Oak Ridge Natl Lab POB 2008,MS-6100 Oak Ridge TN USA37831 SA
Citazione:
I.N. Ivanov et al., "Fluorescence decay study of anisotropic rotations of substituted pyrenes physisorbed and chemically attached to a fumed silica surface", J PHYS CH B, 105(42), 2001, pp. 10308-10315

Abstract

Optical polarization spectroscopy has been used to investigate molecular dynamics of the fluorescent probes 1-pyrenebutanol and 1-pyrenebutyric acid at the solid/air interface of cab-o-sil (fumed silica nanoparticles). Pyrenebutanol was chemically attached to the surface of cab-o-sil through a silyl ether bond, while pyrenebutyric acid was physisorbed on the surface. Dynamics of fluorescence depolarization for both molecules was studied under steady-state and time-resolved conditions. Low and high loadings of the probemolecules were used in our studies to examine the dynamics of the probes motion and excimer formation. Our data indicate that excimer formation is mostly static in nature for the adsorbed probe, but shows more dynamic character for the chemically attached probe with spacer molecules present. Fluorescence lifetimes were dependent on the concentration of the probe molecule and became shorter at higher surface loadings for both the chemically attached and physisorbed probes. For the chemically attached probe, the presenceof excess co-attached biphenyl molecules was found to provide a 2-D solvent-like environment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/12/19 alle ore 03:44:21