Rational synthesis of extended arrays of organic matter in bulk, solution, crystals, and thin films has always been a paramount goal of chemistry. The classical synthetic tools to obtain long-range regularity are, however, limited to noncovalent interactions, which usually yield structurally more random products. Hence, a combination of porosity and regularity in organic covalently bonded materials requires not only the design of molecular building blocks that allow for growth into a nonperturbed, regular geometry but also a condensation mechanism that progresses under reversible, thermodynamic, self-optimizing conditions. Covalent organic frameworks (COFs), a variety of 2D crystalline porous materials composed of light elements, resemble an sp2-carbon-based graphene sheet but have a different molecular skeleton formed by orderly linkage of building blocks to constitute a flat organic sheet. COFs have attracted considerable attention in the past decade because of their versatile applications in gas storage and separation, catalysis, sensing, drug delivery, and optoelectronic materials development. Compared to other porous materials, COFs allow for atomically precise control of their architectures by changing the structure of their building blocks, whereby the shapes and sizes of their pores can be well-tuned.
Covalent Organic Frameworks is a compilation of different topics in COF research, from COF design and synthesis, crystallization, and structural linkages to the theory of gas sorption and various applications of COFs, such as heterogeneous catalysts, energy storage (e.g., semiconductors and batteries), and biomedicine. This handbook will appeal to anyone interested in nanotechnology and new materials of gas adsorption and storage, heterogeneous catalysts, electronic devices, and biomedical devices.
About the Author: Atsushi Nagai is associate professor with the Novel Aerospace Materials group at Delft University of Technology (TU Delft), the Netherlands. He obtained his PhD in polymerization mechanisms and polymerizable monomer design from Yamagata University, Japan, in 2005. The activities pursued during his postdoctoral fellowship and as project assistant professor in Prof. Yoshiki Chujo's laboratory at Kyoto University, Japan, gave him the idea of teaching how fundamental scientific discoveries can translate into actual functional materials such as boron-containing conjugated polymers. He joined the Institute for Molecular Science (IMS), Japan, in 2010 as assistant professor and co-taught many international and postdoctoral students at the Graduate University for Advanced Studies with Prof. Donglin Jiang (professor at the National University of Singapore). In 2015, he was a visiting professor at the University of Texas Southwestern Medical Center, USA.
Dr. Nagai has vast experience and knowledge of wide research fields such as living polymerization and boron chemistry, polyaddition, polycondensation, click chemistry, supermolecular self-assembly, and thermal-resistant materials. His research interests include the design and synthesis of organic porous materials containing COFs and conjugated microporous polymers.
