van Houtem, Michel H. C. J.; Martin-Rapun, Rafael; Vekemans, Jef A. J. M.; Meijer, E. W. published an article in 2010, the title of the article was Desymmetrization of 3,3′-Bis(acylamino)-2,2′-bipyridine-Based Discotics: The High Fidelity of Their Self-Assembly Behavior in the Liquid-Crystalline State and in Solution.Safety of [2,2′-Bipyridine]-3,3′-diamine And the article contains the following content:
Two novel nonsym. disk-shaped mols. 1 and 2 based on 3,3′-bis(acylamino)-2,2′-bipyridine units were synthesized by means of a statistical approach. Discotic 1 possesses six chiral dihydrocitronellyl tails and one peripheral Ph group, whereas discotic 2 possesses six linear dodecyloxy tails and one peripheral pyridyl group. Preorganization by strong intramol. hydrogen bonding and subsequent aromatic interactions induce self-assembly of the discotics. Liquid crystallinity of 1 and 2 was determined with the aid of polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction. Two columnar rectangular mesophases (Colr) have been identified, whereas for C3-sym. derivatives only one Colr mesophase has been found. In solution, the molecularly dissolved state in chloroform was studied with 1H NMR spectroscopy, whereas the self-assembled state in apolar solution was examined with optical spectroscopy. These desymmetrized discotics that lack one aliphatic wedge, behave similar to the sym. parent compound To prove that the stacking behavior of discotics 1 and 2 is similar to that of reported C3-sym. derivatives, a mixing experiment of chiral 1 with C3-sym. 13 has been undertaken, and shown that they indeed belong to one type of self-assembly. This helical J-type self-assembly was further confirmed with UV-vis and photoluminescence spectroscopy. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Safety of [2,2′-Bipyridine]-3,3′-diamine
The Article related to acylaminobipyridine discotic columnar liquid crystal desymmetrization self assembly, discotic columnar liquid crystal transition enthalpy acylaminobipyridine mol orientation and other aspects.Safety of [2,2′-Bipyridine]-3,3′-diamine