Nitrogen-rich covalent organic frameworks: a promising class of sensory materials

Abstract

Covalent organic frameworks (COFs) have emerged as highly crystalline porous organic materials and proved to be the potential candidates for various interesting applications, such as gas adsorption and separation, catalysis,...

Emissive Substoichiometric Covalent Organic Frameworks for Water Sensing and Harvesting

“…Additionally, this COF exhibited a dualpore architecture with bex topology in contrast with frequently observed COF topologies such as honeycomb, square, kagome, and hexagonal lattices. [20][21][22][23] Herein, we report the first example of a highly emissive substoichiometric, donor-acceptor-type 2D-COF, henceforth referred to as COF-SMU-1, using triazine-based tritopic amine and pyrene-based tetratopic aldehyde linkers, featuring free uncondensed aldehyde groups. Although COF-SMU-1 features a similar topology as the recently reported bex-type 2D-COFs, it exhibits remarkably superior emissive properties.…”

“…Additionally, this COF exhibited a dual‐pore architecture with bex topology in contrast with frequently observed COF topologies such as honeycomb, square, kagome, and hexagonal lattices. [ 20–23 ]…”

Guanidine-Based Covalent Organic Frameworks: Cooperation between Cores and Linkers for Chromic Sensing and Efficient CO2 Conversion

“…Covalent organic frameworks (COFs) are ordered porous organic polymers derived from organic modules through dynamic covalent chemistry. , Taking the advantage of modular structural assembly, high chemical stability, and customizable functionalities, COFs have proven to be versatile platforms for material engineering for various applications, such as gas adsorption and separation, catalysis, energy storage, and sensing. − With a COF having the phenol–imine active sites, we have recently demonstrated the first heterogeneous organocatalyst for alkyne carboxylation with CO 2 . Here, we report new N-rich Schiff-base COFs bearing guanidine cores and pyrazine linkers.…”

Covalent organic frameworks and multicomponent reactions: an endearing give-and-take relationship

“…COFs are endowed with fascinating properties including superb crystallinity, this important trait can be influenced by reaction conditions comprising the feeding rate of monomers, addition of a modulator, catalysis by acids or bases, and the aging process. 22 COFs with long-range order structures, superb visible light absorbance, large surface areas, and tunable band gaps have exhibited outstanding performance in diverse applications, 23 including membranes, 24 optoelectronic devices, 25 gas separation and storage 26 sensing, 27 catalysis, 28 and biomedical applications. 29 Our quest has led us to identify COFs as a promising class of materials, which can be accessed via inherently greener and sustainable MCRs and deployed in eco-friendly environmental technologies as photocatalysts, membranes for gas, and adsorbents for heavy metals and dyes.…”