Reaction of electrons trapped in cryogenic matrices with benzophenone

Somani, Ankit; Sander, Wolfram

doi:10.1002/poc.4335

Cited by 3 publications

(2 citation statements)

References 63 publications

(80 reference statements)

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“…Addressing the issues mentioned earlier, polycyclic aromatic hydrocarbons (PAHs; Figure 1a) were chosen as dopants due to their highly conjugated molecular structure and potential for phosphorescence emission, as evidenced in previous studies 27,[35][36] . The matrix chosen to construct the RTP materials with ultra-long afterglow was the benzophenone (BPO) and its derivative (MeBPO) (Figure 1a), which known for its ability to extract electron from other compounds [37][38][39] . The experimental outcomes confirmed that the resultant RTP materials displayed strong phosphorescence with varying colors and duration times.…”

Section: Introductionmentioning

confidence: 99%

Ion-Radical Mediated Multi-Color Ultra-Long Afterglow Materials

Ma,

Liu,

Jiang

et al. 2024

Preprint

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Pure organic persistent room temperature phosphorescence (RTP) has shown great potential in numerous applications, ranging from information encryption and display technologies to bio-applications and beyond. In this work, a suite of multi-color long-lived RTP materials featuring distinct afterglow emissions was constructed using an ion-radical mediated approach. b[c]p/MeBPO emitted a vivid yellow afterglow centered at 560 nm with an impressively long lifetime of 860.01 ms. While compound b[a]a exhibited a near-infrared (NIR) afterglow (τ = 215.96 ms) after doping into the matrix. The transient absorption spectroscopy investigations disclosed that the observed afterglow phenomenon was fundamentally tied to the generation of radical ions rather than the exciplex. These radical ions resulted from the reduction quenching process of the triplet excited state of compound BPO by the ground state of the doping agent. A novel evaluation methodology was devised, rooted in Marcus theory, to gauge the potential of a specific dopant-matrix combination towards generating pronounced afterglow. According to this framework, the enhancement of the afterglow is directly proportional to the decrease in the activation energy (ΔG≠) associated with the electron transfer reaction occurring between the dopant and the matrix. Notably, when the ΔG≠ surpasses 30 kcal/mol, no observable afterglow occurs, as higher ΔG≠ values significantly impede the electron transfer reaction between the two components. Furthermore, the system exhibits exceptional sensitivity, with the dopant as low as 0.02‰ molar ratio between the dopant and the host material. This remarkable dependence of afterglow intensity on the dopant concentration renders the bi-component RTP system highly promising for applications requiring ultra-high sensitivity and broad-spectrum detection capabilities.

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Section: Introductionmentioning

confidence: 99%

Ion-Radical Mediated Multi-Color Ultra-Long Afterglow Materials

Ma,

Liu,

Jiang

et al. 2024

Preprint

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“…However, the photoexcitation of radical anion 2 yielded back benzophenone 1 after losing an electron to the matrix. [1]…”

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confidence: 99%

Reaction of Electrons Trapped in Cryogenic Matrices With Benzophenone

Somani¹,

Sander²

2022

Proceedings of the 2022 International Symposium on Molecular Spectroscopy

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Electron transfer reactions are among the most elementary chemical reactions, which play a fundamental role in organic synthesis, electrochemical processes, and biochemical reactions. In our study, we used sodium as a source of electrons and probed the formation of benzophenone radical anion 2 in an argon and low density amorphous (LDA) water ice matrices using matrix isolation technique.In solid argon, mixture of sodium vapors and benzophenone 1 was co-deposited and after irradiating the matrix with the visible light, electron transfer takes place from sodium to 1 under the formation of radical anion 2. In LDA water ice, hydrated electrons are produced after co-deposition of water with sodium. The hydrated electrons react with benzophenone without photochemical activation and resulted in radical anion 2. However, the photoexcitation of radical anion 2 yielded back benzophenone 1 after losing an electron to the matrix. [1]

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Light induced reactions in cryogenic matrices (highlights 2021–2022)

Fausto,

Nikitin,

Nogueira

2023

Photochemistry

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This chapter surveys research on light induced reactions of organic molecules investigated in cryogenic matrices that has been reported during 2021 and 2022. It highlights studies dealing with conformational changes, tautomerizations and other structural isomerizations induced either by ultraviolet/visible or infrared light, as well as photofragmentation reactions. Emphasis is given to reactive intermediates, including nitrenes, carbenes and radicals. The studies featured in the present review are examples of recent applications of the matrix isolation method, coupled with spectroscopic probing, to these areas of investigation.

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Reaction of electrons trapped in cryogenic matrices with benzophenone

Cited by 3 publications

References 63 publications

Ion-Radical Mediated Multi-Color Ultra-Long Afterglow Materials

Ion-Radical Mediated Multi-Color Ultra-Long Afterglow Materials

Reaction of Electrons Trapped in Cryogenic Matrices With Benzophenone

Light induced reactions in cryogenic matrices (highlights 2021–2022)

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