Bifunctional covalent organic frameworks with two dimensional organocatalytic micropores

Abstract

We report the successful incorporation of bifunctional (acid/base) catalytic sites in the crystalline organocatalytic porous COF (2,3-DhaTph). Due to the presence of acidic (catachol) and basic (porphyrin) sites, 2,3-DhaTph shows significant selectivity, reusability, and excellent ability to perform the cascade reaction.

Covalent organic frameworks based on Schiff-base chemistry: synthesis, properties and potential applications

“…23,24 On the other hand, the use of an irreversible enol to-keto tautomerization following the Schiff-base reaction is also an effective strategy toward the enhancement of chemical stability of the crystalline framework. Thus, the chemical stability and crystallinity in 2D-COFs enhance by introducing -OH functionalities adjacent to the Schiffbase centres (CQN) to form an intramolecular O-HÁ Á ÁNQC hydrogen bond.…”

“…23,24 The H-bonding interactions also play an important role in the construction of the layered framework in 2D-COFs. Thus, stability, crystallinity and porosity can be tuned by using this modification.…”

Tunable Water and CO2 Sorption Properties in Isostructural Azine-Based Covalent Organic Frameworks through Polarity Engineering

“…In recent years, metalorganic frameworks and porous carbons came into focus as potential water sorbents. [11][12][13][14][15] Besides initial experiments by Banerjee and co-workers, [16][17][18] COFs have not been investigated as potential water sorbents in detail so far. COFs have garnered significant attention owing to their tunable pore sizes and high porosity combined with their long-range ordered crystalline structure.…”

Fabrication of Holey Graphene: Catalytic Oxidation by Metalloporphyrin‐Based Covalent Organic Framework Immobilized on Highly Ordered Pyrolytic Graphite

“…Based on the pore size of DhaTph-COF (ca. 2.3 nm) reported in the previous study, [13] the hypothetical hole periodicity can be roughly estimated by measuring the distance between Fe-DhaTph-COF catalytic centers. The average hole periodicity of 8.3 nm and the average neck width (the smallest edge-to-edge distance between two neighboring holes) of 2.0 nm measured on TEM images were larger than the periodicity of Fe(III) catalytic center (i.e., the distance between porphyrin rings).…”