Cycloadditions and Cyclization Reactions via Post-Synthetic Modification and/or One-Pot Methodologies for the Stabilization of Imine-Based Covalent Organic Frameworks

Abstract

Interest in covalent organic frameworks as high-value materials has grown steadily since their development in the 2000s. However, the great advantage that allows us to obtain these crystalline materials—the reversibility of the bonds that form the network—supposes a drawback in terms of thermal and chemical stability. Among the different strategies employed for the stabilization of imine-based Covalent Organic Frameworks (COFs), cycloaddition and other related cyclization reactions are especially significant to obtain highly stable networks with extended π-delocalization and new functionalities, expanding even further the potential application of these materials. Therefore, this entry gathered the most recent research strategies for obtaining stable COFs by means of cyclization reactions, including the Povarov reaction and intramolecular oxidative cyclization reactions as well as some other recent innovative approaches.

Turn‐On Solid‐State Fluorescent Determination of Zinc Ion by Quinoline‐Based Covalent Organic Framework

“…The most established synthesis method for obtaining quinolinecontaining COFs consists of the modification of imine-based COFs with an alkyne derivative to give the desired material with a Povarov reaction. [58] In our case, we decided to adopt the same synthetic strategy but introducing the necessary structural changes in order to enable the appropriate interaction between COF and analyte as it will be presented and discussed. Therefore, in this contribution we describe the successful synthesis of a robust and conjugated 2D aromatic network (Quin-COF) through postsynthetic modification (PSM) of an imine-based COF (TAPB-DMTP-COF).…”