Free Radical Reactivity of Mono‐ and Dichlorosilylene with Muonium

Percival, Paul W.; Brodovitch, Jean‐Claude; Mozafari, Mina; Mitra, Amitabha; West, Robert; Ghadwal, Rajendra S.; Azhakar, Ramachandran; Roesky, Herbert W.

doi:10.1002/chem.201102405

Cited by 39 publications

(19 citation statements)

References 39 publications

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“…An example is 6 , which could add a muonium atom to yield 6 a or 6 b (see Scheme and Figure 8). 16 The calculated hyperfine constants A μ are −12 MHz for 6 a and 152.0 and 10 MHz for cis ‐ and trans ‐ 6 b (Mu cis or trans to Cl), respectively, all far from the observed value, 30.2 MHz. But the spectrum may result from a mixture of cis ‐ 6 b and trans ‐ 6 b .…”

Section: Silylenesmentioning

confidence: 75%

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Silicon Meets Cyclotron: Muon Spin Resonance of Organosilicon Radicals

West

Samedov

Percival

2014

Chemistry A European J

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Section: Silylenesmentioning

confidence: 75%

“…An N‐heterocyclic carbene will even stabilize silicon(II) chloride, as shown by Roesky and his co‐workers 15a. The resulting complex, 5 , captures muonium to yield the TF‐μSR signal shown in Scheme 16. The hyperfine splitting A μ is again surprisingly small, only −22 MHz, and for a related reason (see Figure 6).…”

Section: Silylenesmentioning

confidence: 83%

Silicon Meets Cyclotron: Muon Spin Resonance of Organosilicon Radicals

West

Samedov

Percival

2014

Chemistry A European J

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“…In a study by Percival et al IPr•SiCl 2 (15) was irradiated with muons to give the radical species IPr•SiMuCl 2 (42) with considerable unpaired electron density located at the carbene carbon, as supported by muon spin resonance (μSR) spectroscopy and theoretical calculations [81]. Along the similar theme of carbene-supported radicals, a very interesting combined experimental and theoretical study by the groups of Roesky, Tkach, Stalke, and Frenking appeared in early 2013 concerning the synthesis of the novel silane L • -SiCl 2 -L • (43) diradical (L ¼ CAAC) [82].…”

Section: ð7þmentioning

confidence: 99%

“…][81] and are significantly shortened with respect to the dative Si-C linkage found in IPr•SiCl 2 [1.985(4) Å ][55]. The C-Si-C bond…”

mentioning

confidence: 94%

Recent Advances in the N-Heterocyclic Carbene-Supported Chemistry of Silicon

Rivard

2013

Functional Molecular Silicon Compounds II

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“…17,18 Since that time, a number of muon spin spectra have been observed for silylenes with various structures. [19][20][21] In this paper, we present spectra and muon hyperfine constants for muoniated radicals formed from a selection of nine germylenes, together with calculated values of the coupling constants. Only one TF-SR spectrum has been published to date, 18 with hyperfine constants for radicals derived from 3 and 7 (Scheme 2).…”

Section: Introductionmentioning

confidence: 99%

Germanium-centered free radicals studied by muon spin spectroscopy

et al. 2014

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Transverse-field muon spin rotation (TF-SR) spectra have been recorded for free radicals formed by positive muon irradiation of nine different divalent germanium compounds. Muon-electron hyperfine coupling constants (A ) were determined from the spectra and compared with values predicted from density functional theory molecular orbital (DFT-MO) calculations on the muoniated radicals formed by muonium addition to the germanium atom. The muon hyperfine constants for germylenes containing N-Ge bonds are generally quite large, from 593 to 942 MHz, indicating strong interaction between the muon and the unpaired electron in these radicals. The radical derived from one of the germylenes exhibited a significantly lower muon hyperfine constant, suggesting that in this case the muoniated germyl radical undergoes a coupling reaction to form a digermanyl radical, which is what is detected by SR.Résumé : On a obtenu les spectres transverse champ rotation du spin du muon (TF-SR) en champ transverse de radicaux libres formés suite à l'irradiation d'une série de neuf composés bivalents du germanium par des muons positifs. À partir de ces spectres, les constantes de couplages hyperfines muon-electron (A ) ont été déterminées et comparées aux valeurs fournies par des calculs théoriques de la fonctionnelle de la densité orbitale moléculaire (DFT-MO) sur les radicaux libres muoniatés formés par l'addition du muonium à l'atome du germanium. Les constantes hyperfines du muon incorporé dans des germylènes contenant la liaison N-Ge ont en général des grandes valeurs (entre 593 et 942 MHz), indicatives d'une forte interaction entre le muon et l'électron non-appareillé du radical. Toutefois, dans l'un des cas de cette série de radicaux, la constante hyperfine du muon est beaucoup plus petite; ce résultat peut être interprété comme l'indication que le radical germyl muoniaté subit une réaction de couplage pour former un radical bi-germanyl qui est l'espèce observée par SR dans ce cas particulier.

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Free Radical Reactivity of Mono‐ and Dichlorosilylene with Muonium

Cited by 39 publications

References 39 publications

Silicon Meets Cyclotron: Muon Spin Resonance of Organosilicon Radicals

Silicon Meets Cyclotron: Muon Spin Resonance of Organosilicon Radicals

Recent Advances in the N-Heterocyclic Carbene-Supported Chemistry of Silicon

Germanium-centered free radicals studied by muon spin spectroscopy

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