Covalent-Metal organic Frameworks: Preparation and applications

Within the past few decades, metal–organic frameworks (MOFs) and covalent organic frameworks (COFs) have attracted much attention due to their porous structure, periodicity, and tunability; however, the lack of good stability of MOFs limits its further application, while COFs are limited by the lack of metal active sites. Recently, a new kind of organic frameworks appeared, which used metal clusters of MOFs as secondary building units (SBUs) and synthesized covalent-metal–organic frameworks (C-MOFs) through the dynamic covalent bonding linkage of COFs. C-MOFs combine the advantages of both MOFs and COFs, and also possess the adjustable and predictable periodic porous structure, which has good stability at the and also the presence of metal active sites, which is a novel material. In this review, we provide an overview of the research advances in the synthesis strategies of C-MOFs, as well as the progress of their applications in catalysis, gas storage, and energy storage. In addition, the article ends with a look at the future direction of C-MOFs.