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Photophysics and Photochemistry of Iron Carbene Complexes for Solar Energy Conversion and Photocatalysis

1
Division of Chemical Physics, Department of Chemistry, Lund University, Box 118, SE-22100 Lund, Sweden
2
Theoretical Chemistry Division, Chemistry Department, Lund University, Box 118, SE-22100 Lund, Sweden
3
Center for Analysis and Synthesis, Department of Chemistry, Lund University, Box 118, SE-22100 Lund, Sweden
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(3), 315; https://doi.org/10.3390/catal10030315
Received: 29 January 2020 / Revised: 2 March 2020 / Accepted: 5 March 2020 / Published: 10 March 2020
(This article belongs to the Special Issue N‐Heterocyclic Carbenes and Their Complexes in Catalysis)
Earth-abundant first row transition metal complexes are important for the development of large-scale photocatalytic and solar energy conversion applications. Coordination compounds based on iron are especially interesting, as iron is the most common transition metal element in the Earth’s crust. Unfortunately, iron-polypyridyl and related traditional iron-based complexes generally suffer from poor excited state properties, including short excited-state lifetimes, that make them unsuitable for most light-driven applications. Iron carbene complexes have emerged in the last decade as a new class of coordination compounds with significantly improved photophysical and photochemical properties, that make them attractive candidates for a range of light-driven applications. Specific aspects of the photophysics and photochemistry of these iron carbenes discussed here include long-lived excited state lifetimes of charge transfer excited states, capabilities to act as photosensitizers in solar energy conversion applications like dye-sensitized solar cells, as well as recent demonstrations of promising progress towards driving photoredox and photocatalytic processes. Complementary advances towards photofunctional systems with both Fe(II) complexes featuring metal-to-ligand charge transfer excited states, and Fe(III) complexes displaying ligand-to-metal charge transfer excited states are discussed. Finally, we outline emerging opportunities to utilize the improved photochemical properties of iron carbenes and related complexes for photovoltaic, photoelectrochemical and photocatalytic applications. View Full-Text
Keywords: iron; N-heterocyclic carbene (NHC); photophysics; photochemistry; photocatalysis; solar energy conversion; dye-sensitized solar cells; artificial photosynthesis; solar fuels iron; N-heterocyclic carbene (NHC); photophysics; photochemistry; photocatalysis; solar energy conversion; dye-sensitized solar cells; artificial photosynthesis; solar fuels
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Lindh, L.; Chábera, P.; Rosemann, N.W.; Uhlig, J.; Wärnmark, K.; Yartsev, A.; Sundström, V.; Persson, P. Photophysics and Photochemistry of Iron Carbene Complexes for Solar Energy Conversion and Photocatalysis. Catalysts 2020, 10, 315.

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