Pillar[5]arene Based Pseudo[1]rotaxane Operating as Acid/Base-Controllable Two State Molecular Shuttle was written by Zhao, Qian;Chen, Yuan;Sun, Baobao;Qian, Cheng;Cheng, Ming;Jiang, Juli;Lin, Chen;Wang, Leyong. And the article was included in European Journal of Organic Chemistry in 2019.Quality Control of Pyridin-4-ol This article mentions the following:
A ethylene glycol bridged pyridine and pillar[5]arene based mech. selflocked pseudo[1]rotaxane was constructed successfully. The structure and selflocked conformation of pseudo[1]rotaxane were confirmed by 1H, 2D NMR spectrum and HR-ESI-MS. It was found that in dilute solution the pseudo[1]rotaxane could be operated as an acid/base-controllable two state mol. shuttle while In concentrated solution, the pseudo[1]rotaxane existed as a dimer and could be operated from shrinking state to extension state. In the experiment, the researchers used many compounds, for example, Pyridin-4-ol (cas: 626-64-2Quality Control of Pyridin-4-ol).
Pyridin-4-ol (cas: 626-64-2) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the 锜?bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the 锜?bonds. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C閳ユ弻 in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Quality Control of Pyridin-4-ol