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|Type:||Artigo de periódico|
|Title:||Safranine-T Triplet-State Quenching by Modified Silica Nanoparticles|
|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.|
|Editor:||Amer Chemical Soc|
|Citation:||Journal Of Physical Chemistry C. Amer Chemical Soc, v. 115, n. 37, n. 18122, n. 18130, 2011.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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