《Ring-Opened Hemiporphyrazines: Helical Molecules Exhibiting Circularly Polarized Luminescence》 was written by Tanaka, Yusuke; Murayama, Tomotaka; Muranaka, Atsuya; Imai, Eiyu; Uchiyama, Masanobu. Reference of 2,6-Diaminopyridine And the article was included in Chemistry – A European Journal in 2020. The article conveys some information:
Authors designed and synthesized a new type of small helical mol. exhibiting intense circularly polarized luminescence (CPL) (12H) by modifying a 20π-electron hemiporphyrazine with a large transition magnetic dipole moment. The hemiporphyrazine ring was opened and one addnl. pyridine unit was introduced, resulting in an overlap of two pyridine rings. X-ray structure anal. confirmed that 12H and its zinc complex (1Zn) adopt a helical geometry. A racemic mixture of 1Zn was resolved into two enantiomers ((P)- and (M)-1Zn), which exhibited CPL with a high luminescence dissymmetry factor (glum) value of ±2.1×10-2. The origin of the large glum value was rationalized by DFT calculations Helical structures could be formed in a diastereoselective manner by covalently attaching chiral units to the skeleton (1’2H and 1’Zn). 1Zn Was found to possess chiral recognition ability for amines. The experimental part of the paper was very detailed, including the reaction process of 2,6-Diaminopyridine(cas: 141-86-6Reference of 2,6-Diaminopyridine)
2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Reference of 2,6-Diaminopyridine