Rate constant measurements for radical addition reactions with C60 by means of time-resolved EPR and spin-echo detected pulsed EPR spectroscopy

Takahashi, Hirona; Hirano, Hiroki; Nomura, Kayo; Hagiwara, Kenta; Kawai, Akio

doi:10.1016/j.cplett.2020.138205

Cited by 3 publications

(2 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Weber and Turro reported a method to determine the radical addition reaction rate constants with substituted olefins using pulsed EPR, where the electron spin echo (ESE) decay time, T M *, of the reacting radical was monitored against the olefin concentration. Recently, we applied this method to measure the rate constants for the radical scavenging reaction of C 60 . TR-EPR measurement enables us to observe short-lived radicals having DEP − with a time-resolution of approximately 100 ns, which is high enough to observe the elemental reaction process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C₇₀ with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals

2022

Self Cite

View full text Add to dashboard Cite

The radical scavenging reactions of C70 were investigated using time-resolved (TR-) and pulsed electron paramagnetic resonance (EPR) methods. In the diphenylphosphine oxide (DPPO) radical and C70 system, structural isomers of the adduct radicals of C70 appeared in the TR-EPR spectrum with clear hyperfine structures due to the phosphorus atom. Four isomers were identified through the analysis of the hyperfine coupling constants. The assignment of the adduct radicals was confirmed by the semiempirical calculation of the relative addition reaction rate constants that produce each isomer. The radical scavenging rate constants, k sca, of C70 in toluene were determined for DPPO, hydroxylcyclohexyl, and 2-hydroxypropyl radicals through electron spin echo observations using the pulsed-EPR method. The k sca values were nearly 109 mol–1 dm3 s–1 and were almost equal to the diffusion-controlled rate constant in toluene. This proves that C70 acts as an excellent radical scavenger. In addition, the radical addition rate constants, k add, of C70 for varying carbon atoms in C70 were obtained by considering the peak intensity ratio of the adduct radicals in the TR-EPR spectrum. In this study, we demonstrated that the large number of carbon atoms in pentagons (five-membered rings) is responsible for the high reactivity of fullerenes.

show abstract

Section: Introductionmentioning

confidence: 99%

“…In this method, spin coherence is created in the radical in the resonant magnetic field. The radical scavenging rate constant of C 60 , k sca , was approximately 10 9 mol –1 dm 3 s –1 (=M –1 s –1 ), which is almost equal to the diffusion-controlled rate constant …”

Section: Introductionmentioning

confidence: 99%

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C₇₀ with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals

2022

Self Cite

View full text Add to dashboard Cite

show abstract

Advancements and Prospects in Continuous Wave Time-resolved Electron Paramagnetic Resonance

Zhang,

Zhou,

et al. 2024

Chem. Res. Chin. Univ.

View full text Add to dashboard Cite

Stepwise generation of spin-polarized radicals and their reactions in the photolysis of an oxime ester compound as studied by pulsed EPR spectroscopy

Takahashi¹,

Hirano²,

Kawai³

2023

Journal of Photochemistry and Photobiology A: Chemistry

View full text Add to dashboard Cite

Rate constant measurements for radical addition reactions with C60 by means of time-resolved EPR and spin-echo detected pulsed EPR spectroscopy

Cited by 3 publications

References 30 publications

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C₇₀ with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C₇₀ with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals

Advancements and Prospects in Continuous Wave Time-resolved Electron Paramagnetic Resonance

Stepwise generation of spin-polarized radicals and their reactions in the photolysis of an oxime ester compound as studied by pulsed EPR spectroscopy

Contact Info

Product

Resources

About

Rate constant measurements for radical addition reactions with C60 by means of time-resolved EPR and spin-echo detected pulsed EPR spectroscopy

Cited by 3 publications

References 30 publications

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C70 with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C70 with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals

Advancements and Prospects in Continuous Wave Time-resolved Electron Paramagnetic Resonance

Stepwise generation of spin-polarized radicals and their reactions in the photolysis of an oxime ester compound as studied by pulsed EPR spectroscopy

Contact Info

Product

Resources

About

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C₇₀ with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals

Pulsed EPR Study of the Initial Steps of Radical-Scavenging Reactions of C₇₀ with Diphenylphosphine Oxide, Hydroxycyclohexyl, and 2-Hydroxypropyl Radicals