期刊
CHEMCATCHEM
卷 15, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202300974
关键词
Inner-sphere electron transfer; Polynuclear metal; Photoredox; Organic transformation; Radical
Photo-induced electron transfer is a crucial process in photochemical reactions, but traditional outer-sphere single electron transfer mechanisms have limitations due to the requirement of redox potential matching. In this review, we focus on the inner-sphere single electron transfer mechanism exhibited by polynuclear gold photocatalysts and emphasize its significant role in photocatalysis.
Photo-induced electron transfer is a fundamental step in photochemical reactions, where light energy is used to drive chemical transformations. However, conventional outer-sphere single electron transfer mechanisms encounter multiple limitations, notably requiring redox potential matching between photocatalysts and substrates, thereby impeding the activation of non-activated carbon-halogen bonds. In this concept review, we present an elucidation of the photophysical and photochemical properties exhibited by polynuclear gold photocatalysts, with a particular emphasis on their inner-sphere single electron transfer mechanism. By exploring these intricate aspects, we endeavor to furnish readers with a more profound insight into the remarkable potential of polynuclear gold photocatalysts and the indispensable role played by inner-sphere electron transfer in the realm of photocatalysis. Upon photon absorption, polynuclear gold complexes undergo metal-centered excitation, resulting in long-lived triplets with an increasing coordination number. This feature facilitates direct binding with substrates in the inner coordination sphere. The formed exciplex can undergo inner-sphere electron transfer to reduce or oxidize molecules, even in cases where the redox potentials do not match.image
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