Tuning the ²LMCT Deactivation of Cyclometalated Iron Carbene Complexes with Electronic Substituent Effects.

ABSTRACT: Fe^III complexes based on the [Fe^III(ImP)₂]⁺ motif (ImP = bis(2,6-bis(3-methylimidazol-2-ylidene-1-yl)phenylene)), where the ligand contains both carbene and cyclometalated moieties, are a promising class of photoactive materials made from this abundant metal. In this work, it is shown that bromo or furanyl substituents attached to the cyclometalating moiety of the ImP ligands stabilize the ²LMCT excited state to very different extent resulting in opposing effects on the ²LMCT lifetime. For [Fe^III(ImPBr)₂]⁺, the lifetime (255 ps) of its moderately stabilized ²LMCT state (1.85 eV) is slightly increased compared to the parent complex (1.90 eV, 240 ps) pointing to an increased barrier

SUBMITTER: Mishra A 

PROVIDER: S-EPMC12376266 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature