In 2019,Physical Chemistry Chemical Physics included an article by Ballesteros, Paola; Cuadrado, Alba; Gilabert, Alejandra; Fajari, Lluis; Sires, Ignasi; Brillas, Enric; Almajano, Maria Pilar; Velasco, Dolores; Anglada, Josep M.; Julia, Luis. COA of Formula: C12H7Br2N. The article was titled 《Formation of a stable biradical triplet state cation versus a closed shell singlet state cation by oxidation of adducts of 3,6-dimethoxycarbazole and polychlorotriphenylmethyl radicals》. The information in the text is summarized as follows:
We report an exptl. and theor. study of two stable radical adducts of the triphenylmethyl series, 1 and 2, whose composition and mol. structure are distinguished by the content and position of chlorine atoms in phenyls. The electrochem. study through cyclic voltammetry of these open layer species shows the existence of two reversible processes, related to reduction and oxidation, to stable charged species. The chem. oxidation of both radical adducts gives rise to stable cations, whose fundamental state has a biradical triplet electronic structure or a closed shell singlet character, depending on the electronic conjugation between the donor and acceptor electron moieties. The presence of chlorines adjacent to the nitrogen in 1 breaks the conjugation between both halves, facilitating the formation of a triplet electronic state of the cation, while the absence of chlorines in these positions in 2 facilitates partial conjugation and stabilizes the closed shell singlet electronic state of the cation. In the experiment, the researchers used 3,6-Dibromo-9H-carbazole(cas: 6825-20-3COA of Formula: C12H7Br2N)
3,6-Dibromo-9H-carbazole(cas: 6825-20-3) is used as a pharmaceutical intermediate, and also an important intermediate of synthesizing optoelectronic materials. It has been used as a reagent in the synthesis of P7C3-A20 which is a potent neuroprotective agent.COA of Formula: C12H7Br2N
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary