On the photoluminescence in triarylmethyl-centered mono-, di-, and multiradicals

• Daniel Straub,
• Markus Gross,
• Mona E. Arnold,
• Julia Zolg and
• Alexander J. C. Kuehne

Beilstein J. Org. Chem. 2025, 21, 964–998, doi:10.3762/bjoc.21.80

• unresolved questions that must be addressed to unlock the full potential of trityl-based radicals in advanced technological applications. Keywords: Chichibabin hydrocarbon; COF; Gomberg radical; MOF; Müller hydrocarbon; Thiele hydrocarbon; Introduction Gomberg-type, triarylmethyl-centered radicals

• have produced y0 = 0.3 for the non-chlorinated Thiele diradical [92]. Interestingly, the Thiele hydrocarbon without chlorination in the meta-positions of the four peripheral phenyl-rings (TTH), exhibits higher y0 of up to 0.4, indicating the mesomeric equilibrium to be further on the open-shell side

• (see Figure 12a) [92]. Also the perfluorinated version of the Thiele hydrocarbon (TFC) has comparable diradical character of y0 = 0.35 [93]. This increased diradical character has been attributed to increased structural flexibility in TTH and TFC. Their C–C bonds are longer than in the non-chlorinated