Robert W Jones, Rory A Cowin, Iona I Ivalo, Dimitri Chekulaev, Thomas M Roseveare, Craig R Rice, Julia A Weinstein, Paul I P Elliott, Paul A Scattergood
Photoluminescent coordination complexes of Cr(III) are of interest as near-infrared spin-flip emitters. Here, we explore the preparation, electrochemistry, and photophysical properties of the first two examples of homoleptic N -heterocyclic carbene complexes of Cr(III), featuring 2,6- bis (imidazolyl)pyridine (ImPyIm) and 2-imidazolylpyridine (ImPy) ligands. The complex [Cr(ImPy)3 ]3+ displays luminescence at 803 nm on the microsecond time scale (13.7 μs) from a spin-flip doublet excited state, which transient absorption spectroscopy reveals to be populated within several picoseconds following photoexcitation...
May 2, 2024: Inorganic Chemistry