Photocatalytic Oxygenation Reactions with a Cobalt Porphyrin Complex Using Water as an Oxygen Source and Dioxygen as an Oxidant
- 주제(기타) Chemistry, Multidisciplinary
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2019
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000161230
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/jacs.9b02864
- PubMed https://pubmed.ncbi.nlm.nih.gov/31145595
초록/요약
Photocatalytic oxygenation of hexamethylbenzene occurs under visible-light irradiation of an O(2)(-)saturated acetonitrile solution containing a cobalt porphyrin complex Co-II(TPP) (TPP2 = tetraphenylporphyrin dianion), water, and triflic acid (HOTf) via a one-photon-two-electron process, affording pentamethylbenzyl alcohol and hydrogen peroxide as products with a turnover number of >6000; in this reaction, H2O and O-2 were used as an oxygen source and a two-electron oxidant, respectively. The photocatalytic mechanism was clarified by means of electron paramagnetic resonance, time-resolved fluorescence, and transient absorption measurements as well as O-18-labeling experiments with (H2O)-O-18 and O-18(2). To the best of our knowledge, we report the first example of efficient photocatalytic oxygenation of an organic substrate by a metal complex using H2O as an oxygen source and O-2 as a two-electron oxidant.
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