期刊
SCIENCE
卷 363, 期 6424, 页码 249-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aau7160
关键词
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资金
- Danish Council for independent Research [5051-00095A, 8021-00410B]
- Carlsberg Foundation
- Alexander von Humboldt Foundation
- Swedish Foundation for Strategic Research
- Swedish Research Council
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation
- Swedish National Supercomputing Center LUNARC
- Swedish National Supercomputing Center NISC via SNIC
- LMK Foundation
- Stiftelsen Die Engkvist Byggmastare
- Can Try er Foundation
- Wenner-Gren Foundation
- Crafoord Foundation
- Sten K Johnsons Stiftelse
- Royal Physiographic Society
Iron's abundance and rich coordination chemistry are potentially appealing features for photochemical applications. However, the photoexcitable charge-transfer states of most iron complexes are limited by picosecond or subpicosecond deactivation through low-lying metal-centered states, resulting in inefficient electron-transfer reactivity and complete lack of photoluminescence. In this study, we show that octahedral coordination of iron(Ill) by two mono-anionic facial tris-carbene ligands can markedly suppress such deactivation. The resulting complex [Fe(phtmeimb)(2)](+), where phtmeimb is {phenyl[tris(3-methylimidazol-1-ylidene)]borate}(-), exhibits strong, visible, room temperature photoluminescence with a 2.0-nanosecond lifetime and 2% quantum yield via spin-allowed transition from a doublet ligand-to-metal charge-transfer ((LMCT)-L-2) state to the doublet ground state. Reductive and oxidative electron-transfer reactions were observed for the (2)LMCTstate of [Fe(phtmeimb)(2)](+) in bimolecular quenching studies with methylviologen and diphenylamine.
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