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. 2022 Oct 24;61(43):e202210521.
doi: 10.1002/anie.202210521. Epub 2022 Sep 27.

Unusual Quartet-Doublet Phosphorescence from the Phosphaethynyl Radical, CP

Elavenil Ganesan  1 , Thomas Custer  1 , Arun-Libertsen Lawzer  1 , Jean-Claude Guillemin  2 , Robert Kołos  1
Affiliations
Free article

Unusual Quartet-Doublet Phosphorescence from the Phosphaethynyl Radical, CP

Elavenil Ganesan et al. Angew Chem Int Ed Engl. .
Free article

Abstract

We report the first detection of phosphorescence from the phosphaethynyl radical. This rare instance of quartet-doublet emission, studied here in solid argon, is presumably promoted by efficient intersystem crossing from the originally photoexcited doublet (B2 Σ+ ) to the adjacent second quartet state, 14 Δ. Vibronic progressions were traced for the a4 Σ+ -X2 Σ+ and a4 Σ+ -A2 Пi systems from their origins up to (v'=0)→(v''=5) and (v'=0)→(v''=2) bands, respectively. The measured phosphorescence lifetime is 108 ± 3 ms.

Keywords: CP Radical; Carbon Monophosphide; Quartet-Doublet Emission; Radical Phosphorescence.

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