A metal–covalent organic framework catalyst with pincer coordination units for boosting transfer hydrogenation of quinolines with ammonia borane

Abstract

A crystalline 2D nickel-coordinated bis(imino)pyridine metal–covalent organic framework (Ni-bipy-COF) material is easily fabricated by incorporating nickel ions into bis(imino)pyridine pincer COF skeleton. The Ni-bipy-COF catalyst can be applied to catalyze...

Electrochemical valorization of HCl for the production of chlorine via a proton-filter functional covalent organic framework

“…Tab-Dfp was synthesized by using a reported method with slight modications. 45,48,49 The synthesis procedure consisted of the Schiff base condensation reaction of 2,6-diformylpyridine (Dfp) (11.53 mg, 0.085 mmol) and 1,3,5-tris(4-aminophenyl) benzene (Tab) (20 mg, 0.056 mmol) in 2 mL of a 1,4-dioxane/mesitylene mixture (1 : 1 v/v ratio). The reaction was conducted in a sealed pressure tube with a catalytic amount of acetic acid (50 ml, 6 M aqueous).…”

“…S4 and S5 †) presented a distinctive peak at ∼157 ppm corresponding to imine carbon (-C]N), conrming the Tab-Dfp and Tta-Dfp formation. 41,43,45,[48][49][50] The carbon atoms of the phenyl, triazine, and pyridine groups are responsible for the signals at 120, 126, 130, 150, and 167 ppm respectively, conrming the Tta-Dfp's chemical structure. Similarly, the carbon atoms of the pyridine and phenyl rings of the Tab-Dfp structure are responsible for the signals at 147, 136, 126, 121, 114 ppm, con-rming the Tab-Dfp's chemical structure.…”

“…S9 and S11 †). 45,48,49 The morphological aspects of Tta-Dfp and Tab-Dfp by eld emission-scanning electron microscopy (FE-SEM) revealed spherical morphology with spikes (Fig. S12 †).…”

Novel Cobalt(II)-Decorated 1D Covalent Organic Framework for Selective Oxidation of Ethylbenzene

“…As a newly emerging class of crystalline porous organic materials, covalent organic frameworks (COFs) have been increasingly utilized in catalysis, − molecule separation, , energy storage, and other applications due to their predesignable structure, remarkable surface area, and excellent chemical stability. − By introducing coordination units with a strong metal binding ability such as bipyridyl, , terpyridyl, bis­(imino)­pyridine, and porphyrins, , COFs can be designed as excellent support for transition metals and effectively reduce metal leaching. Nevertheless, such COFs are still dominated by two-dimensional (2D) network topology until now.…”

Two-Dimensional Porphyrinic Metal–Organic Framework Composites as a Photocatalytic Platform for Chemoselective Hydrogenation

“…The related hydrogenation reaction has been generally achieved under harsh conditions such as high H 2 pressure (2.5–60 bar) or elevated temperature (353–433 K) . For comparison, formic acid, alcohol, and ammonia borane (NH 3 ·BH 3 ) are used as alternative hydride donors in the transfer hydrogenation of quinolines, which can be carried out under much milder conditions. − On the other hand, the visible light-driven organic reactions with high selectivity are important to build a sustainable society. − So far, there are few works on the photocatalytic transfer hydrogenation of quinolines. − Therefore, it is of great significance to develop an efficient photocatalyst for the selective transfer hydrogenation of quinolines using a safe hydrogen source under mild conditions.…”