Enter Mn^IV-NHC: A Dark Photooxidant with a Long-Lived Charge-Transfer Excited State.

ABSTRACT: Detailed photophysical investigation of a Mn(IV)-carbene complex has revealed that excitation into its lowest-energy absorption band (∼500 nm) results in the formation of an energetic ligand-to-metal charge-transfer (LMCT) state with a lifetime of 15 ns. To the best of our knowledge, this is the longest lifetime reported for charge-transfer states of first-row-based transition metal complexes in solution, barring those based on Cu, with a d¹⁰ configuration. A so-called superoxidant, Mn(IV)-carbene exhibits an excited state potential typically only harnessed via excited states of reactive organic radical species. Furthermore, the long-lived excited state in this case is found to be a dark doublet, with its transition to the quartet ground state being spin-forbidden, a contrast to

SUBMITTER: Kaul N 

PROVIDER: S-EPMC11378296 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature