Covalent organic frameworks anchored with frustrated Lewis pairs for hydrogenation of alkynes with H₂

Abstract

Frustrated Lewis Paris (FLPs) chemistry has been widely explored in the field of catalytic hydrogenation. However, the FLPs, which was usually used as homogeneous catalysts, quickly lost their catalytic reactivity...

Frustrated Lewis Pairs Bridged by Water and Immobilized in a Metal–Organic Framework as a Recyclable Transfer Hydrogenation Nanocatalyst

“…The binding energy of B 1s in B(C 6 F 5 ) 3 ·H 2 O is 192.3 eV, which shifts to the lower value of 190.4 eV for the FLP/MIL-101(Cr) catalyst. The change is attributed to the electron transformation from DMEDA immobilized in MIL-101(Cr) to the B atom of B(C 6 F 5 ) 3 ·H 2 O . This result again proves that B(C 6 F 5 ) 3 ·H 2 O interacts with −N(CH 3 ) 2 of DMEDA.…”

“…After that, the Hu group used the same approach to construct two heterogeneous FLP catalysts, in which the bulky molecule B­(C 6 F 5 ) 3 (LA) was anchored with a bulky LB in the solid COF via weak covalent bonds. These catalysts can be easily recycled in the hydrogenation of alkynes at least 10 times without losing their catalytic capacity . However, the above special structural characteristics of composing FLPs with bulky LA and LB cannot be widely used for the construction of heterogeneous FLPs.…”

“…These catalysts can be easily recycled in the hydrogenation of alkynes at least 10 times without losing their catalytic capacity. 29 However, the above special structural characteristics of composing FLPs with bulky LA and LB cannot be widely used for the construction of heterogeneous FLPs. Recently, a noteworthy work about fully recyclable heterogeneous FLP catalysts was reported by Ma and co-workers.…”

Band gap opening from displacive instabilities in layered covalent-organic frameworks

“…9 Both 2D and 3D COFs exhibit the advantages of exible and customizable crystal structures, high chemical and thermal stability, and high porositymaking them promising candidates for applications such as energy storage, [10][11][12][13][14][15][16][17][18][19][20][21][22] ion and molecule separation, [23][24][25] optoelectronics 26,27 and catalysis. [28][29][30][31][32] Various forms of disorder exist in experimentallysynthesized COFs, such as bond breakage, pore collapse and stacking faults. Such imperfections can signicantly affect the properties of 2D COFs, causing loss of crystallinity, porosity, and conductivity.…”

“…9 Both 2D and 3D COFs exhibit the advantages of flexible and customizable crystal structures, high chemical and thermal stability, and high porosity – making them promising candidates for applications such as energy storage, 10–22 ion and molecule separation, 23–25 optoelectronics 26,27 and catalysis. 28–32…”