Dual-functional ionic porous organic framework for palladium scavenging and heterogeneous catalysis

Abstract

Porous organic frameworks (POFs) with predesigned structures and tunable porosities have been widely studied in adsorption and heterogeneous catalysis. Introducing ionic structure into the framework endows POFs with new functionalities...

Preparation of a reusable and pore size controllable porous polymer monolith and its catalysis of biodiesel synthesis

“…During the past decades, porous materials including organic, inorganic and organic-inorganic materials have been extensively studied [1][2][3][4][5][6][7][8][9][10] due to their special physicochemical properties. Porous materials have been used in various elds, such as energy storage, [11][12][13][14] energy conversion, [15][16][17][18] adsorption, [19][20][21][22][23][24][25] catalysis, [26][27][28] sensing, [29][30][31] CO 2 capture, [32][33][34][35][36] etc. In recent years, the investigation of porous organic polymer (a class of highly crosslinked amorphous polymers possessing nano-pores) based catalysts has attracted signicant attention owing to their conned pore space and high surface area which is benecial for improving catalytic performance and stability.…”

PdII on Guanidine-Functionalized Fe3O4 Nanoparticles as an Efficient Heterogeneous Catalyst for Suzuki–Miyaura Cross-Coupling and Reduction of Nitroarenes in Aqueous Media

“… 30 − 32 Although guanidine-based catalysts show remarkable catalytic activity, they lack in recovery and reusability. 32 , 33 To ease the recovery of the catalyst, deprived of any considerable loss, and increase the reusability of the catalyst, we have tethered the guanidine ligand to a magnetic substrate and immobilized Pd on magnetic substrate-supported guanidine. 34 , 35 …”

“…30−32 Although guanidine-based catalysts show remarkable catalytic activity, they lack in recovery and reusability. 32,33 To ease the recovery of the catalyst, deprived of any considerable loss, and increase the reusability of the catalyst, we have tethered the guanidine ligand to a magnetic substrate and immobilized Pd on magnetic substrate-supported guanidine. 34,35 Considering the above facts and research interest in developing novel catalyst systems and methods for various reactions and applications, 36−38 we have prepared novel Pdbased guanidine-conjugated iron oxide nanoparticles as a highly effective magnetically separable catalyst.…”

“…In particular, guanidine is a suitable N-donor ligand owing to its capacity to shift the positive charge to a guanidine moiety, a behavior that leads to strongly basic and highly nucleophilic compounds with an increased ability to coordinate with metal ions. As a result, guanidine-type ligands have been specifically used to prepare highly active homogeneous/heterogeneous catalysts with transition metals that can catalyze various organic reactions. − Although guanidine-based catalysts show remarkable catalytic activity, they lack in recovery and reusability. , To ease the recovery of the catalyst, deprived of any considerable loss, and increase the reusability of the catalyst, we have tethered the guanidine ligand to a magnetic substrate and immobilized Pd on magnetic substrate-supported guanidine. , …”

Highly efficient Lewis acid catalytic activity of the tritylium ion at the node of a tensile organic framework

“… 4–7 Notably, in terms of catalysis, most ionic frameworks have been used to carry active ionic counterparts or metal nanoparticles, and have seldom been used as catalytic sites themselves. In addition, research on porous ionic polymers has mainly focused on boron-, 8 nitrogen-, 9 oxygen- 10 or phosphorus-centered ions, 11 but seldom on carbon-centered ions by now. 12 …”