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Type: Artigo de periódico
Title: Safranine-T Triplet-State Quenching by Modified Silica Nanoparticles
Author: Arce, VB
Bertolotti, SG
Oliveira, FJVE
Airoldi, C
Gonzalez, MC
Allegretti, PE
Martire, DO
Abstract: Modified silica nanoparticles (NPs) were obtained by esterification of the silanol groups of fumed silica nanoparticles with 4-hydroxymethyl-N,N-dimethylbenzenamine. These particles were characterized by Fourier transform infrared spectroscopy, (13)C and (29)Si nuclear magnetic resonance, thermogravimetry, X-ray photoelectron spectroscopy, transmission electron microscopy with energy-dispersive spectroscopy, and measurement of the specific surface area. Laser flash photolysis experiments at the excitation wavelength of 532 nm were performed with safranine-T and NP suspensions in acetonitrile. Comparative experiments of safranine-T with solutions of 4-hydroxymethyl-N,N-dimethylbenzenamine and two other related alcohols were performed. Evidence for the triplet safranine-T H-abstraction from the organic group of the particles is obtained. The electron transfer from the organic group to the triplet excited states of safranine-T also takes place, as shown by the absorption traces obtained at 50 mu s after the laser shot.
Country: EUA
Editor: Amer Chemical Soc
Citation: Journal Of Physical Chemistry C. Amer Chemical Soc, v. 115, n. 37, n. 18122, n. 18130, 2011.
Rights: fechado
Identifier DOI: 10.1021/jp205112u
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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