Covalent Organic Frameworks
A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Organic Crystalline Materials".
Deadline for manuscript submissions: closed (28 June 2023) | Viewed by 6412
Special Issue Editors
Interests: covalent organic frameworks
Special Issue Information
Dear Colleagues,
Covalent organic frameworks (COFs) are a new class of crystalline porous organic material possessing two- or three- dimensional structures. COFs are constructed from pre-designed organic building units connecting by strong covalent bonds between light atoms (e.g., B, C, N, O, P, Si). Since they were firstly reported by Yaghi et al. in 2005, COFs have emerged as a material with a wealth of applications, such as sorption, separation, optoelectronics, catalysis, sensors, drug delivery, energy storage, etc. COFs exemplify the manner in which reticular chemistry is practiced, with the control at molecular level being exercised over matter. The facile bottom-up synthesis of COFs introducing precise perturbations in chemical composition results in the highly controlled tunability of structural diversity and framework properties such as porosity, conjugation property, etc.
As a crystalline material, progress in developing their chemistry often dominates the ability to crystallize them. In most cases, reversible reactions have been used to build COF materials so that self-correction can be realized in the crystal growth of COFs by chemical equilibrium. For example, borate ester condensation reaction and imine condensation reaction are mostly used in the crystal growth of COFs. However, the strength of covalent bonding between the building units often yields polycrystalline products. Hence, structural analysis of COFs usually combines multiple characterization methods, for example, powder X-ray diffraction (PXRD) modeling and TEM techniques. In 2018, large-sized single-crystal COFs were obtained, enabling the use of single-crystal X-ray diffraction to identify atomically precise COF structures.
In this Special Issue, we will focus on the design, synthesis, crystal growth, properties, and emerging applications of COFs.
Dr. Xing Han
Dr. Tianqiong Ma
Guest Editors
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Keywords
- covalent organic frameworks
- single crystal
- reticular chemistry
- framework material
- porous organic material
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