Pulse radiolysis and product analysis of triethylsilane in methanol

Getoff, N.; Ritter, A.; Schwörer, F.; Bayer, Peter

doi:10.1016/1359-0197(92)90038-h

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…Most of the literature data on the methanol radiolysis were obtained with specific electron scavengers such as N 2 O, SF 6 , CH 3 Br, biphenyl, Cd 2+ , and Ag + 6 and concern the electron yield. The radiolytic products resulting from oxidized radical and electron scavenging by triethylsilane R 3 SiH methanolic solutions were carefully analyzed and a mechanism for their formation proposed . Because of the multiplicity of products, even in pure methanol, and of the variable scavenging action of solutes, the mechanism is complex and still under debate.…”

Section: Resultsmentioning

confidence: 99%

“…It seems that no species other than solvated electrons are participating to the pulse radiolysis reduction of silver cations. In particular, the radicals • CH 2 OH dimerize or disproportionate more efficiently than in γ-radiolysis due to their higher concentration and to the high rate constant k = 2.8 × 10 9 M -1 s -1 . Thus they might have disappeared before larger oligomers are formed and before silver cations could adsorb on them.…”

Section: Resultsmentioning

confidence: 99%

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Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

et al. 2002

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The optical absorption spectra of Ag 0 , Ag 2 + , transient oligomers, and stable clusters were studied in deaerated methanol by pulse and γ-radiolysis methods and compared with data obtained from studies using other solvents. From the decay of esolv at 620 nm, the formation rate constant of Ag 0 was determined to be k(esolv + Ag + ) ) (2.6 ( 0.6) × 10 10 M -1 s -1 . The coalescence rate of transient oligomers is particularly slow and the growth process is not completed within 2 s after the pulse. The surface plasmon band of stable clusters obtained by γ-radiolysis in methanol is intense and sharp ( 385 nm ) 1.8 × 10 4 M -1 cm -1 ). The clusters are readily oxidized by oxygen. By adding methyl viologen MV 2+ to the solution containing stable silver clusters, the blue color of MV +• is transitorily observed, and the small clusters are developed into larger ones. Similarly, by pulse radiolysis of a mixture of silver cations and MV 2+ , silver atoms and MV +• are formed immediately through solvated electron scavenging, but subsequently additional MV +• are produced by reduction of MV 2+ by Ag 0 and small oligomers. In a further step, MV +• radicals reduce Ag + cations adsorbed on large clusters and let them develop eventually to larger sizes. The general mechanism of the methanol radiolysis is revisited on the basis of electron and radical scavenging by Ag + and silver clusters, and values of the yields of methanol radiolysis species are discussed in detail.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

et al. 2002

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“…Therefore, the solutes are indirectly affected as they scavenge the primary species issued from the solvent and this specificity offers indeed the We recently revisited the radiolysis of methanol (Mostafavi et al, 2002). On the basis of previous scavenger studies by pulse and steady-state radiolysis (Jha et al, 1972;Wardman, 1973, 1975;Hentz and Kenney-Wallace, 1974;Hunt et al, 1975;Getoff et al, 1992Getoff et al, , 1993Ferradini and Jay-Gerin, 1996) and of the effects that we observed in the presence of silver ions or charged clusters, which scavenge both solvated electrons and d CH 2 OH/CH 3 O d radicals, we were able to complete the general scheme of the methanol radiolytic mechanism, with the yields of the various embranchments (Mostafavi et al, 2002).…”

Section: Introductionmentioning

confidence: 98%

Radiolysis of silver ion solutions in ethylene glycol: solvated electron and radical scavenging yields

Soroushian

Lampre

Belloni

et al. 2005

Radiation Physics and Chemistry

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“…However, the silane radicals could be one of the main intermediate species. In fact, Getoff et al , reported the appearance of a transient absorption spectrum with a maximum at ∼260 nm in their work on pulse radiolysis of silane compounds. These authors assigned the origin of this peak to the formation of silane transients.…”

Section: Resultsmentioning

confidence: 99%

Glutathione-Functionalized Organosilicon Oxide Nanoparticles for Bioimaging and Forensics

Guleria

Chavan²,

Neogy

et al. 2020

ACS Appl. Nano Mater.

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Herein, we report an electron beam mediated one-pot, rapid approach for the synthesis of blue light emitting organosilicon oxide nanoparticles (OSiNPs) in aqueous solution with a potential for scale-up production. Mechanistic studies based on pulse radiolysis revealed that unlike the generally believed solvated electron (e sol − ) driven process, the present synthesis proceeds through the reaction of hydroxyl radical (•OH) with the precursor molecules resulting in the formation of silane-derived radicals. Subsequently, these radicals react with each other to form OSiNPs. Compositional studies by XPS, FTIR, and Raman indicate the presence of siloxane/silicone and silica (SiO 2 ) like units as the major constituents in the NPs. XRD pattern signifies the amorphous nature of the NPs, while imaging studies revealed self-assembling of NPs (3−5 nm) into a porous structure. Notably, the NPs exhibited excitation-wavelength-dependent photoluminescence (PL) spectra, pointing to the presence of multiple emission centers with varying energy levels. The nature of these emission centers and their heterogeneous distribution was analyzed in detail through pH and absorbed dose dependent PL studies, HF treatment, fluorescence excitation spectrum, temperature dependent steady state, and time-resolved PL studies. Moreover, OSiNPs were functionalized with a biocompatible ligand, i.e., Lglutathione (L-Glu), which significantly enhanced the quantum efficiency (up to ∼25%) of emission as well as colloidal stability. These functionalized NPs (L-Glu@OSiNPs) were found to exhibit less toxicity up to a concentration of ∼0.5 mg/mL. Interestingly, the L-Glu@OSiNPs exhibited tumor selectivity (in A549 human lung cancer cells) at lower pH along with cell labeling capabilities with propensity to localize at the nucleus. Furthermore, in addition to their usage in anticounterfeiting measures, application of L-Glu@OSiNPs in fingerprinting was also demonstrated by testing on a variety of surfaces. Meanwhile, linear and reproducible PL intensity variations of OSiNPs signify highly sensitive and robust thermosensing properties of OSiNPs.

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Pulse radiolysis and product analysis of triethylsilane in methanol

Cited by 5 publications

References 13 publications

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

Transient and Stable Silver Clusters Induced by Radiolysis in Methanol

Radiolysis of silver ion solutions in ethylene glycol: solvated electron and radical scavenging yields

Glutathione-Functionalized Organosilicon Oxide Nanoparticles for Bioimaging and Forensics

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