Synthesis of C−C Bonded Two‐Dimensional Conjugated Covalent Organic Framework Films by Suzuki Polymerization on a Liquid–Liquid Interface

Abstract

Synthesis of free-standing two-dimensional (2D) conjugated covalent organic framework (COF) films linked by CÀCb onds is highly desirable.N ow av ery simple and mild strategy has been developed to synthesize them by Suzuki polymerization on aw ater-toluene interface in ar efrigerator. The versatility of this strategy was confirmed by the successful synthesis of two different 2D-COF films:ap orous graphene and aporphyrin-contained 2D-COF.Both 2D-COF films have large lateral sizeand their crystalline domains were visualized by high resolution TEM. Based on the wide compatibility of Suzuki reaction, our breakthrough work opened adoor for the synthesis of various 2D conjugated COF films.For application studies,t he porous graphene exhibits ag ood carrier mobility, which is muchh igher than À C = N À linked 2D COF films and agood catalytic activity for hydrogen evolution reaction, which is comparable with nitrogen-or phosphorus-doped graphene. Angewandte Chemie Communications

An Fe-N/S-C hybrid electrocatalyst derived from bimetal-organic framework for efficiently electrocatalyzing oxygen reduction reaction in acidic media

“…exhibits the high resolution C 1s spectra of NC and Fe-N/S-C-X, with binding energies of 284.7, 285.1, 285.5, 286.5 and 288.9 eV, corresponding to C@C, C-S, C-C, C-O/C-N, and C-C@O, respectively[25][26][27], indentifying N and S are bonded with carbon and co-doped into the carbon skeleton.…”

Mechanisms of Defect Correction by Reversible Chemistries in Covalent Organic Frameworks

“…Covalent organic frameworks (COFs) as crystalline porous polymers are becoming a central molecular platform − of realizing diverse functionalities in a series of urgent applications, such as catalysis, , gas separation, − energy storage, , and optoelectronic devices. , However, the surprising difficulty to build the structures with a long-range molecular ordering through crystallization has long puzzled researchers and limited applications. − In the structural tiling process of extensive polygons connected by covalent bonds, defects are prone to form and impede further crystallization, leading to polycrystal/crystallites or amorphous solids . Reversible chemistries that are capable of correcting defects have been extensively employed to synthesize highly crystalline COFs. − However, only a few experiments have successfully exploited the reaction conditions to construct single crystals of large size up to hundreds of micrometers , by tuning growth kinetics which have not been elucidated.…”

A Semiconducting Two‐Dimensional Polymer as an Organic Electrochemical Transistor Active Layer

“…Recent examples of interfacial, direct-growth, or additive manufacturing film production exemplify that high-quality 2DP films are rapidly becoming available. [21,28,[34][35][36][37][38][39] However, micrometer-scale patterning needed for arrays of sensors or circuits, especially in conjunction with metallic contacts, interconnects, and insulation has not been readily achieved.…”