The overlooked NIR luminescence of Cr(ppy)

Cr(ppy) 3 , a structural analog of the green phosphorescent Ir(ppy) 3 , emits even in solution at room temperature from a weakly distorted spin-flip state at 910 nm (Hppy = 2-phenylpyridine). The low energy arises from an enhanced covalence of the Cr-C bonds as compared to Cr-N bonds. Lower temperat...

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Published in:Chemical communications (Cambridge, England) England), 2022-03, Vol.58 (22), p.371-374
Main Authors: Stein, Laura, Boden, Pit, Naumann, Robert, Förster, Christoph, Niedner-Schatteburg, Gereon, Heinze, Katja
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Summary:Cr(ppy) 3 , a structural analog of the green phosphorescent Ir(ppy) 3 , emits even in solution at room temperature from a weakly distorted spin-flip state at 910 nm (Hppy = 2-phenylpyridine). The low energy arises from an enhanced covalence of the Cr-C bonds as compared to Cr-N bonds. Lower temperature reduces thermally activated decay increasing the emission intensity. Cr(ppy) 3 - a structural analog of Ir(ppy) 3 - displays spin-flip emission in the NIR with microseconds lifetime at room temperature in solution (Hppy = 2-phenylpyridine), which is rationalised by a strong ligand field and metal-ligand covalence.
ISSN:1359-7345
1364-548X
DOI:10.1039/d2cc00680d