Photoredox catalysis via consecutive ²LMCT- and ³MLCT-excitation of an Fe(iii/ii)-N-heterocyclic carbene complex.

ABSTRACT: Fe-N-heterocyclic carbene (NHC) complexes attract increasing attention as photosensitisers and photoredox catalysts. Such applications generally rely on sufficiently long excited state lifetimes and efficient bimolecular quenching, which leads to there being few examples of successful usage of Fe-NHC complexes to date. Here, we have employed [Fe(iii)(btz)₃]³⁺ (btz = (3,3'-dimethyl-1,1'-bis(p-tolyl)-4,4'-bis(1,2,3-triazol-5-ylidene))) in the addition of alkyl halides to alkenes and alkynes via visible light-mediated atom transfer radical addition (ATRA). Unlike other Fe-NHC complexes, [Fe(iii/ii)(btz)₃]^3+/2+ benefits from sizable charge transfer excited state lifetimes ≥0.1 ns in both oxidation states, and the Fe(iii) ²LMC

SUBMITTER: Ilic A 

PROVIDER: S-EPMC9383194 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature