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Mechanistic Insight into Hydrogen-Bond-Controlled Crystallinity and Adsorption Property of Covalent Organic Frameworks from Flexible Building Blocks
journal contribution
posted on 2018-03-19, 00:00 authored by Xinghua Guo, Yin Tian, Meicheng Zhang, Yang Li, Rui Wen, Xing Li, Xiaofeng Li, Ying Xue, Lijian Ma, Chuanqin Xia, Shoujian LiThe
effective control of crystallinity of covalent organic frameworks
(COFs) and the optimization of their performances related to the crystallinity
have been considered as big challenges. COFs bearing flexible building
blocks (FBBs) generally own larger lattice sizes and broader monomer
sources, which may endow them with unprecedented application values.
Herein, we report the oriented synthesis of a series of two-dimensional
(2D) COFs from FBBs with different content of intralayer hydrogen
bonds. Studies of H-bonding effects on the crystallinity and adsorption
properties indicate that partial structure of the COFs is “locked”
by the H-bonding interaction, which consequently improves their microscopic
order degree and crystallinity. Thus, the regulation of crystallinity
can be effectively realized by controlling the content of hydrogen
bonds in COFs. Impressively, the as-prepared COFs show excellent and
reversible adsorption performance for volatile iodine with capacities
up to 543 wt %, much higher than all previously reported adsorbents,
although the variation tendency of adsorption capacities is opposite
to their crystallinity. This study provides a general guidance for
the design and construction of highly/appropriately crystalline COFs
and ultrahigh-capacity iodine adsorbents.
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monomer sourcescrystallinityadsorption performanceH-bonding interactionlattice sizesapplication valuesorder degreeadsorption propertiesintralayer hydrogen bondsFlexible Building Blocksas-prepared COFs showadsorption capacitiesbuilding blocksCovalent Organic Frameworksvariation tendencyH-bonding effectsultrahigh-capacity iodine adsorbentsFBBMechanistic InsightHydrogen-Bond-Controlled Crystallinityhydrogen bondsAdsorption Property
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