Open AccessTurn‐On Photocatalysis: Creating Lone‐Pair Donor–Acceptor Bonds in Organic Photosensitizer to Enhance Intersystem Crossing
Author(s) -
Liu Mingjie,
Liu Junnan,
Zhou Kai,
Chen Jingwen,
Sun Qi,
Bao Zongbi,
Yang Qiwei,
Yang Yiwen,
Ren Qilong,
Zhang Zhiguo
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202100631
Subject(s) - photocatalysis , photosensitizer , lone pair , photochemistry , intersystem crossing , moiety , conjugated system , covalent bond , catalysis , chemistry , acceptor , triazine , combinatorial chemistry , nanotechnology , materials science , organic chemistry , molecule , polymer , excited state , physics , nuclear physics , singlet state , condensed matter physics
There is growing interest in developing triplet photosensitizers in terms of implementing photochemical strategies in synthetic chemistry. However, synthesis of stable triplet organic photosensitizers is nontrivial and often requires the use of heavy atoms. Herein, an alternative strategy is demonstrated to enhance the triplet generation efficiency by implanting lone‐pair donor–acceptor bonds in the conjugated covalent organic frameworks (COFs). This powerful method is validated using COFs that host triazine, a moiety that has been extensively investigated in photocatalysis. Spectroscopic analysis and theoretical calculations reveal substantial improvements in the photoabsorptivity and triple‐state photogeneration efficiency, consistent with catalytic tests concerning industrially relevant sulfide oxidation. These systems represent a promising addition to the rapidly increasing arsenal of synthetic photocatalytic systems.