A Photophysical Study of Sensitization-Initiated Electron Transfer: Insights into the Mechanism of Photoredox Activity
A Photophysical Study of Sensitization-Initiated Electron Transfer: Insights into the Mechanism of Photoredox Activity
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DOI：
10.1002/anie.201916359
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发表时间：
2020-04-07
影响因子：
16.6
通讯作者：
Moore, Evan G.
中科院分区：
文献类型：
--
作者：
Coles, Max S.;Quach, Gina;Moore, Evan G.
光催化反应的发展为扩大合成有机化学的范围提供了许多新的机会。在发现新反应性的同时，人们一致认为，为了揭示潜在的激发态反应，专注于提供详细的机制洞察是最大限度地形成所需产物所必需的。考虑到这一点，我们研究了最近报道的活化芳基卤化物的C-H芳基化的敏化引发电子转移（sei - et）反应。利用各种技术，特别是纳秒瞬态吸收光谱，我们能够从参与反应的激发态物种中区分出几个特征信号，随后在各种条件下的动力学分析有助于详细了解可能的反应机制。
The development of photocatalytic reactions has provided many novel opportunities to expand the scope of synthetic organic chemistry. In parallel with progress towards uncovering new reactivity, there is consensus that efforts focused on providing detailed mechanistic insight in order to uncover underlying excited-state reactions are essential to maximise formation of desired products. With this in mind, we have investigated the recently reported sensitization-initiated electron transfer (SenI-ET) reaction for the C-H arylation of activated aryl halides. Using a variety of techniques, and in particular nanosecond transient absorption spectroscopy, we are able to distinguish several characteristic signals from the excited-state species involved in the reaction, and subsequent kinetic analysis under various conditions has facilitated a detailed insight into the likely reaction mechanism.