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Review
Chemistry, Multidisciplinary
Winald R. Kitzmann et al.
Summary: Transition metal complexes with photoactive charge-transfer excited states, such as [Ru(bpy)(3)](2+) and [Cr(ddpd)(2)](3+), have been widely studied. The properties of emissive charge-transfer and spin-flip states, including their energy and lifetimes, as well as their responses to external stimuli, are discussed in this Review. The strengths and weaknesses of these states in applications like photocatalysis and circularly polarized luminescence are also identified.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Jakob Steube et al.
Summary: This study presents a luminescent iron compound that exhibits dual emission behavior from ligand-to-metal charge transfer (LMCT)- and metal-to-ligand charge transfer (MLCT)-dominated states. The compound has a unique ligand design that enables the presence of energetically accessible MLCT states, providing potential for electron transfer reactions in photoredox catalysis.
Article
Chemistry, Multidisciplinary
Wolfgang Leis et al.
Summary: Controlling the order and lifetimes of electronically excited states is crucial for efficient light-to-potential energy conversion. This study presents a luminescent and photoreactive iron(II) complex, which is the first high-performance analogue of prototypical ruthenium sensitizers. The double cyclometalation of a phenylphenanthroline framework at iron(II) promotes the formation of a triplet metal-to-ligand charge transfer ((MLCT)-M-3) state as the lowest energy excited state. Near-infrared (NIR) luminescence exhibits a monoexponential decay with a lifetime of 2.4 ns in the solid state and 1 ns in the liquid phase. At 77 K, the lifetime extends to 14 ns, accompanied by a narrowing of the NIR emission band within the range of 1170-1230 nm. The Fe(II) chromophore, featuring a (MLCT)-M-3 excited-state redox potential of -2 V vs the ferrocene/ferrocenium couple, is demonstrated to be a sensitizer for light-driven synthesis through the radical cross-coupling of 4-chlorobromobenzene and benzene.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Akin Aydogan et al.
Summary: Efficient excited-state electron transfer was achieved between an iron(III) photosensitizer and organic electron donors under green light irradiation, using a long-lived and luminescent ligand-to-metal charge-transfer (LMCT) excited state iron photosensitizer. The catalyst demonstrated yields exceeding 90% in a benchmark dehalogenation reaction, with enhanced stability compared to a typical photosensitizer. The initial catalytic step involved electron transfer from an amine to the photoexcited iron sensitizer, shown to occur with a large cage-escape yield, indicating potential advantages of Fe(III) photosensitizers in reductive electron transfer.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Review
Chemistry, Multidisciplinary
Michael R. Wasielewski et al.
NATURE REVIEWS CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Matthew D. Woodhouse et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Article
Chemistry, Inorganic & Nuclear
Pavel Chábera et al.
COORDINATION CHEMISTRY REVIEWS
(2020)
Review
Multidisciplinary Sciences
James K. McCusker
Article
Multidisciplinary Sciences
Kasper Skov Kjmer et al.
Article
Chemistry, Physical
Jong-Hwa Shon et al.
ACS ENERGY LETTERS
(2019)
Review
Chemistry, Multidisciplinary
Oliver S. Wenger
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2018)
Review
Chemistry, Multidisciplinary
Yizhu Liu et al.
ACCOUNTS OF CHEMICAL RESEARCH
(2016)
Review
Chemistry, Multidisciplinary
Nathan A. Romero et al.
Article
Chemistry, Multidisciplinary
Azhar Fakharuddin et al.
ENERGY & ENVIRONMENTAL SCIENCE
(2014)
Review
Chemistry, Multidisciplinary
Anders Hagfeldt et al.
