Air-stable organic radicals in solid state from a triphenylamine derivative by UV irradiation

A feasible strategy to obtain air-stable triphenylamine radicals in the solid state by introducing conjugated donor–acceptor modules

“…We reported previously that condensed and ordered aggregates, similar to UV-triggered aggregates of TM4 , were observed when using N, N -dimethylformamide (DMF) as the solvent with a high boiling point. 36 Therefore, these AFM results demonstrate that TM1 and TM2 have weaker stacking capacity than TM3 and TM4 , implying that the introduction of the A unit can significantly strengthen the intermolecular packing. In addition, as shown in Fig.…”

“…S7, ESI†), while that of TM4 was reported elsewhere. 36 After UV illumination, the chloroform solutions of TM1–3 exhibit strong and similar EPR signals with a g -value of 2.006 (Fig. 7a).…”

“…Synthetic details of the intermediate and spectroscopic characterization of TM1-3 are found in the ESI, † while that of TM4 was reported elsewhere. 36 Compounds TM1-4 exhibit good solubilities in many common organic solvents, such as dichloromethane, chloroform, and tetrahydrofuran, and possess good solution processing characteristics.…”