Ultrafast photoactivation of C─H bonds inside water-soluble nanocages

Das, Ankita; Mandal, Imon; Venkatramani, Ravindra; Dasgupta, Jyotishman

doi:10.1126/sciadv.aav4806

Cited by 45 publications

(52 citation statements)

References 72 publications

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“…14b). 51 Upon illumination, a series of electron-rich alkyl-aromatic hydrocarbons, such as 9-methylanthracene ( 41), 1methylnaphthalene (42), and toluene (43), encapsulated in cage 39b were found to be readily converted to the corresponding neutral benzyl radicals via a water-assisted proton-coupled electron transfer (PCET) process, and thus activated their C-H bonds. Subsequently, the photogenerated long-lived benzyl radical within 39b reacted with O 2 to give the oxidized product.…”

Section: Radical-catalyzed Reactionsmentioning

confidence: 99%

Recent advances and perspectives on supramolecular radical cages

et al. 2021

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Section: Radical-catalyzed Reactionsmentioning

confidence: 99%

Recent advances and perspectives on supramolecular radical cages

et al. 2021

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“…Some of the transient absorption experiments have been performed in Bhabha Atomic Research Centre [65,66] and Tata Institute of Fundamental Research, Mumbai. [67,68] The femtosecond transient absorption setup has been described elsewhere. [69,70] Briefly, laser pulses with energy of ~4 mJ/pulse, wavelength of 800 nm and full width at half maximum of 70 fs at repetition rate of 1 kHz from a one box amplified laser (Libra, Coherent, USA), is divided into two parts.…”

Section: Instrumentationmentioning

confidence: 99%

Role of Solvent in Electron‐Phonon Relaxation Dynamics in Core‐Shell Au−SiO₂ Nanoparticles

et al. 2021

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Relaxation dynamics of plasmons in AuÀ SiO 2 core-shell nanoparticles have been followed by femtosecond pump-probe technique. The effect of excitation pump energy and surrounding medium on the time constants associated with the hot electron relaxation has been elucidated. A gradual increase in the electron-phonon relaxation time with pump energy is observed and can be attributed to the higher perturbation of the electron distribution in AuNPs at higher pump energy.Variation in time constants for the electron-phonon relaxation in different solvents is rationalized on the basis of their thermal conductivities, which govern the rate of dissipation of heat of photoexcited electrons in the nanoparticles. On the other hand, phonon-phonon relaxation is found to be much less effective than electron-phonon relaxation for the dissipation of energy of the excited electron and the time constants associated with it remain unaffected by thermal conductivity of the solvent.

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“…Later, Dasgupta and co-workers achieved the photo-oxidation of benzyl C–H bonds based on this approach. 21 Under a high pressure of oxygen, a benzyl radical was generated then oxidized to benzaldehyde.…”

Section: Introductionmentioning

confidence: 99%