A Dynamic Three-Dimensional Covalent Organic Framework was written by Ma, Yun-Xiang;Li, Zhi-Jun;Wei, Lei;Ding, San-Yuan;Zhang, Yue-Biao;Wang, Wei. And the article was included in Journal of the American Chemical Society in 2017.Reference of 55490-87-4 This article mentions the following:
A guest-induced reversible crystal-structure transformation is identified in a new 3D covalent organic framework (COF) by comprehensive analyses using powder X-ray diffraction, organic vapor sorption isotherm, and 129Xe NMR spectroscopy. The revolving imine bond in interpenetrating 3D networks is uncovered as the key to the dynamic behavior, the potential applications of which are illustrated by gas separation and heterogeneous catalysis, thus paving the way to the design of stimuli-responsive and multifunctional COF materials. In the experiment, the researchers used many compounds, for example, 2-(Anthracen-9-ylmethylene)malononitrile (cas: 55490-87-4Reference of 55490-87-4).
2-(Anthracen-9-ylmethylene)malononitrile (cas: 55490-87-4) belongs to nitriles. Nitrile carbon shifts are in the range of 115閳?25 ppm whereas in isonitriles the shifts are around 155閳?65 ppm. Industrially, the main methods for producing nitriles are ammoxidation and hydrocyanation. Both routes are green in the sense that they do not generate stoichiometric amounts of salts.Reference of 55490-87-4
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts