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Fe-II Hexa N-Heterocyclic Carbene Complex with a 528 ps Metal-to-Ligand Charge-Transfer Excited-State Lifetime
Lund Univ, Dept Chem, Div Phys Chem, Box 124, SE-22100 Lund, Sweden..
Lund Univ, Dept Chem, Div Phys Chem, Box 124, SE-22100 Lund, Sweden.;Stanford Univ, SLAC Natl Accelerator Lab, PULSE Inst, Menlo Pk, CA 94025 USA..
Lund Univ, Dept Chem, CAS, Box 124, SE-22100 Lund, Sweden..ORCID-id: 0000-0002-2322-6403
Lund Univ, Dept Chem, Div Phys Chem, Box 124, SE-22100 Lund, Sweden..
Vise andre og tillknytning
2018 (engelsk)Inngår i: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 9, nr 3, s. 459-463Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The iron carbene complex [Fe-II(btz)(3)](PF6)(2) (where btz = 3,3'-dimethyl-1,1'-bis(p-tolyl)-4,4'-bis(1,2,3-triazol-5-ylidene)) has been synthesized, isolated, and characterized as a low-spin ferrous complex. It exhibits strong metal-to-ligand charge transfer (MLCT) absorption bands throughout the visible spectrum, and excitation of these bands gives rise to a (MLCT)-M-3 state with a 528 ps excited-state lifetime in CH3CN solution that is more than one order of magnitude longer compared with the MLCT lifetime of any previously reported Fe-II complex. The low potential of the [Fe(btz)(3)](3+)/[Fe(btz)(3)](2+) redox couple makes the (MLCT)-M-3 state of [Fe-II(btz)(3)](2+) a potent photo-reductant that can be generated by light absorption throughout the visible spectrum. Taken together with our recent results on the [Fe-III(btz)(3)](3+) form of this complex, these results show that the Fe-II and Fe-III oxidation states of the same Fe(btz)(3) complex feature long-lived MLCT and LMCT states, respectively, demonstrating the versatility of iron N-heterocyclic carbene complexes as promising light-harvesters for a broad range of oxidizing and reducing conditions.

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2018. Vol. 9, nr 3, s. 459-463
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URN: urn:nbn:se:uu:diva-348923DOI: 10.1021/acs.jpclett.7b02962ISI: 000424315900001PubMedID: 29298063OAI: oai:DiVA.org:uu-348923DiVA, id: diva2:1201508
Forskningsfinansiär
Knut and Alice Wallenberg FoundationSwedish Energy AgencySwedish Research CouncilStiftelsen Olle Engkvist ByggmästareThe Crafoord FoundationCarl Tryggers foundation Tilgjengelig fra: 2018-04-26 Laget: 2018-04-26 Sist oppdatert: 2018-04-26bibliografisk kontrollert

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