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Cited by 20 publications
(7 citation statements)
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“…This is reminiscent of earlier reports that O2 acts as an electron acceptor promoting electron transfer on alumina and silica-alumina. 13 3. Observation of Photoreaction at Low Temperature.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…This is reminiscent of earlier reports that O2 acts as an electron acceptor promoting electron transfer on alumina and silica-alumina. 13 3. Observation of Photoreaction at Low Temperature.…”
Section: Resultsmentioning
confidence: 99%
“…Here, O2 reacts with conduction band electrons producing superoxide anion (O2*-).7-10 By contrast, there have been few studies of the effect of O2 on the photolysis of organic compounds on silica-based solids.11 •12 In some cases it was observed that O2 promotes electron transfer, the O2 acting as an electron acceptor. 13 However, it was also reported that the presence of O2 effectively quenches excited states of aromatic compounds, either excited singlet states or low-lying triplet states, and thus decreases the yield of organic radical cations. 14 The formation of organic radical cations is considered to be a biphotonic process; i.e., the triplet states of the aromatic molecule are produced via excitation of the trapped electrons and further reactions have been not clarified.…”
Section: Introductionmentioning
confidence: 99%
“…This reaction is similar to that in radiation chemistry, where OH* radical adducts are quantitatively converted to hydroxy compounds.35 However, in radiation chemistry, the OH* radical adducts are converted to hydroxy compounds, while in the present system, Pyr(OH)* radical can convert to dihydroxypyrene. Pyr(OH)*, a free radical, may also react with oxygen at a diffusion-controlled rate leading to peroxy radicals Pyr(OH)• + 02 -Pyr(0H)00' (6) According to Dorfman further reaction could lead to the formation of hydroxypyrene through an elimination of HO2* or to a formation of peroxide29 Pyr(0H)00' -PyrOH + H02* (7) Pyr(0H)00" -* peroxide -»• products (8) As shown in Figure 8, the presence of O2 during the solvent extraction process enhances peaks F3, F4, and F5, while in the absence of O2 these peaks are weak. The similarity of the absorption and the fluorescence spectra suggests that F3,F4, and F5 have similar functional groups.…”
Section: Resultsmentioning
confidence: 99%
“…Figure7. Diffuse reflectance spectra of pyrene adsorbed on silica-alumina (T" = 750 °C), before (solid line) and after (dotted line) the addition of water vapor.…”
mentioning
confidence: 99%
“…434,[522][523][524][525][526] In this context, we reiterate that the recent significant progress in organic radical cation chemistry in zeolites has its roots in the seminal studies of Rooney, Leftin, Hall, and others in the 1960s on amorphous silicas and aluminas. 257,[319][320][321][322][323][324][325][326][327][328][329][330][527][528][529] The adsorption of electron-rich arenes, alkenes, heterocycles, etc. on acid solids spontaneously generated radical cations by ET from the organic substrate to the support.…”
Section: Organic Radical Cations Generated In Inorganic Solids Relate...mentioning
confidence: 99%