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. Author manuscript; available in PMC: 2023 Jun 20.
Published in final edited form as: Angew Chem Int Ed Engl. 2022 Apr 21;61(25):e202200725. doi: 10.1002/anie.202200725

Table 2.

Comparison of Stern-Volmer Luminescence Quenching

fac-Ir(ppy)3 [Ir(dFppy)2dtbbpy]PF6 fac-Ir(dFppy)3
yield of [2+2]a 71% 41% 49%
ET (kcal/mol)b 55.2 55.4 60.1
KSV (4a) (M−1) 120.8 232.1 999.7
KSV (1) (M−1) 9.0 67.1 476.8
KSV (4a) /KSV (1) 13.4 3.5 2.1
a

Condition: 4a (0.2 mmol, 1.0 equiv), 1 (5.0 equiv), [Ir] (1.0 mol %) in CH2Cl2 (0.4 M), 450 nm, 24 h.

b

ref. (27)