2024/12/26 by Maxwell Rhames, Nora L. Burnett, William Tocco +7 · 1 voice · 1 citation
Materials Science · Medicine · #Atomic physics #Charge (physics) #Computer science #Excited state #Lanthanide and Transition Metal Complexes #Magnetism in coordination complexes #Manganese #Materials science #Metal complexes synthesis and properties #Metallurgy #Physics #Quantum mechanics #Spin (aerodynamics) #State (computer science) #Thermodynamics
paper · pdf · doi:10.26434/chemrxiv-2024-r2qq0
openalex publication_date 2024/12/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/14
Manganese is an attractive earth-abundant metal for chromophores because it has multiple oxidation states, making it well-suited for photochemical applications involving electron transfer reactivity. Unfortunately, the tendency of manganese (II) to form high-spin complexes with metal-centered excited states has limited its viability. Herein, we disclose an air-stable S = ½ Mn(II) complex with (N)-heterocyclic carbene ligands. Spectroscopy revealed panchromatic absorption with two main bands in the visible region (with maxima at 480 nm and 580 nm), which have mixed charge-transfer and metal-centered character. Each band produces a unique emission spectrum in the range of 600-800 nm upon excitation. In both cases, time-resolved emission spectroscopy revealed biphasic kinetics for the ground state recovery, with a lifetime of 1 ns at 620 nm.