Oda, Susumu; Kawakami, Bungo; Yamasaki, Yuki; Matsumoto, Ryuji; Yoshioka, Mayu; Fukushima, Daisuke; Nakatsuka, Soichiro; Hatakeyama, Takuji published an article in 2022. The article was titled 《One-Shot Synthesis of Expanded Heterohelicene Exhibiting Narrowband Thermally Activated Delayed Fluorescence》, and you may find the article in Journal of the American Chemical Society.Formula: C6H4ClI The information in the text is summarized as follows:
An expanded heterohelicene consisting of three BN2-embedded [4]helicene subunits (V-DABNA-Mes) was synthesized by 1-shot triple borylation. The key to success is the excessive use of B tribromide in an autoclave. Based on the multiple resonance effect of three B and six N atoms, V-DABNA-Mes exhibited a narrowband sky-blue thermally activated delayed fluorescence with a full width at half-maximum of 16 nm. The resonating π-extension minimized the singlet-triplet energy gap and enabled rapid reverse intersystem crossing with a rate constant of 4.4 × 105 s-1. The solution-processed organic light-emitting diode device, employed as an emitter, exhibited a narrowband emission at 480 nm with a high external quantum efficiency of 22.9%. The experimental process involved the reaction of 1-Chloro-3-iodobenzene(cas: 625-99-0Formula: C6H4ClI)
1-Chloro-3-iodobenzene(cas: 625-99-0) belongs to organic iodides. The carbon-iodine bond is weaker than other carbon-halogen bonds due to the poor electronegative nature of the iodine atom. In general, organic iodides are light-sensitive and turn yellow during storage, owing to the formation of iodine.Formula: C6H4ClI
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com