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Luminescence and reactivity of a charge-transfer excited iron complex with nanosecond lifetime
Lund Univ, Div Phys Chem, Dept Chem, Box 124, SE-22100 Lund, Sweden.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
Lund Univ, CAS, Dept Chem, Box 124, SE-22100 Lund, Sweden.ORCID-id: 0000-0002-2322-6403
Lund Univ, Div Phys Chem, Dept Chem, Box 124, SE-22100 Lund, Sweden.ORCID-id: 0000-0002-0531-5138
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2019 (engelsk)Inngår i: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 363, nr 6424, s. 249-253Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
AMER ASSOC ADVANCEMENT SCIENCE , 2019. Vol. 363, nr 6424, s. 249-253
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URN: urn:nbn:se:uu:diva-376883DOI: 10.1126/science.aau7160ISI: 000456140700029PubMedID: 30498167OAI: oai:DiVA.org:uu-376883DiVA, id: diva2:1288213
Forskningsfinansiär
Swedish Foundation for Strategic Research Swedish Research CouncilSwedish Energy AgencyKnut and Alice Wallenberg FoundationSwedish National Infrastructure for Computing (SNIC)Stiftelsen Olle Engkvist ByggmästareCarl Tryggers foundation Wenner-Gren FoundationsThe Crafoord FoundationTilgjengelig fra: 2019-02-12 Laget: 2019-02-12 Sist oppdatert: 2019-02-12bibliografisk kontrollert

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