The overlooked NIR luminescence of Cr(ppy)3

Chem Commun (Camb). 2022 Mar 15;58(22):3701-3704. doi: 10.1039/d2cc00680d.

Abstract

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.

MeSH terms

  • Iridium / chemistry
  • Luminescence*
  • Organometallic Compounds* / chemistry

Substances

  • Organometallic Compounds
  • Iridium