Exploiting Charge-Transfer States for Maximizing Intersystem Crossing Yields in Organic Photoredox Catalysts.

Exploiting Charge-Transfer States for Maximizing Intersystem Crossing Yields in Organic Photoredox Catalysts.
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DOI:
10.1021/jacs.8b01001
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发表时间:
2018-04-11
影响因子:
15
通讯作者:
Damrauer NH
Damrauer NH
中科院分区:
化学1区
文献类型:
--
作者:
Sartor SM;McCarthy BG;Pearson RM;Miyake GM;Damrauer NH

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含过渡金属的光氧化还原催化剂(PC)的一个重要特征是能够以高量子产率获得以自旋多重性变化为特征的长寿命激发态。对于有机PC来说,促进激发态系间窜越(ISC)面临着挑战,特别是当需要有效的激发态还原剂时。在此,我们报告了一种利用正交π系统和中间能量电荷转移激发态的设计,以在高度还原(E0* = -1.7 V vs SCE)、可见光吸收的基于吩恶嗪的PC中最大化ISC产率(ΦISC)。研究表明,用 N-苯基简单取代 N-萘基可将 ΦISC 从 0.11 显着提高至 0.91,而不会改变重要的催化性能,例如 E0*。
A key feature of prominent transition-metal-containing photoredox catalysts (PCs) is high quantum yield access to long-lived excited states characterized by a change in spin multiplicity. For organic PCs, challenges emerge for promoting excited-state intersystem crossing (ISC), particularly when potent excited-state reductants are desired. Herein, we report a design exploiting orthogonal π-systems and an intermediate-energy charge-transfer excited state to maximize ISC yields (ΦISC) in a highly reducing (E0* = −1.7 V vs SCE), visible-light-absorbing phenoxazine-based PC. Simple substitution of N-phenyl for N-naphthyl is shown to dramatically increase ΦISC from 0.11 to 0.91 without altering catalytically important properties, such as E0*.
DOI: 10.1021/jacs.7b12074
发表时间: 2018-04-18
影响因子: 15
作者:
McCarthy BG;Pearson RM;Lim CH;Sartor SM;Damrauer NH;Miyake GM
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