Green and Facile Preparation of Covalent Organic Frameworks Based on Reaction Medium for Advanced Applications

Abstract

Covalent organic frameworks (COFs), as a new class of crystalline, well‐ordered, and porous materials with intermittent constructions, are formed via organic structural parts connected through covalent bonds. These materials have been employed in several fields comprising pollutant adsorption and separation, catalysis, electrical conductivity, gas storage, etc. The preparation of COFs is mainly applied in tubes with high temperatures and degassing treatment. Furthermore, the reaction medium is involved in toxic organic solvents like toluene, dioxane, mesitylene, acetonitrile, and so on. Hence, discovering clean medium and green approaches has attracted wide attention. Recently, facile, less dangerous, and greener methods have been developed for COFs synthesis in diverse applications like performing the reaction at ambient temperature or employing aqueous solvents, ionic liquids, and a mixture of organic solvents/water. This review article summarizes the eco‐friendly production approaches of COFs for diverse applications.

Photostimulus-Responsive Peptide Dot-Centered Covalent Organic Polymers: Effective Pesticide Sensing via Enhancing Accessibility

“…Recently, porous organic polymers have drawn widespread attention in the field of sensing due to the availability of plentiful building blocks and their tunable structures, porosity, and functions. − Therein, covalent organic polymers (COPs), which are constructed from light organic constituents, have been demonstrated to own a microporous or a mesoporous structure, superior stability, and a highly tunable structure . Based on these advantages, COPs are widely applied in fields of contaminant removal and sensing, including heavy metals, antibiotics, pesticides, organic dyes. − The diversity of building blocks and the pore environment provides opportunities to decorate the backbone of COPs with new functional groups, which is usually done via two approaches: direct synthesis of COPs through the construction of functional monomers, and the introduction of functional groups onto the backbone of COP via postsynthetic modification, where the former is relatively simpler and easier to implement .…”

Covalent organic frameworks (COFs) as carrier for improved drug delivery and biosensing applications

“…COFs, metal-free cousins of MOFs, as newly developed organic polymers, have caused ripples of excitement among researchers striving to exploit their promising drug delivery potential. These crystalline porous polymers emerged recently and are characterized by their molecular building blocks containing periodic dynamic covalent bonds (Azadi & Dinari, 2023). This unique feature grants them enhanced stability and adaptability when compared to inorganic particles that rely on ionic or metallic bonds (Yaghi, 2016).…”