title: Pore surface engineering in covalent organic frameworks.
abstract: Covalent organic frameworks (COFs) are a class of important porous materials that allow atomically precise integration of building blocks to achieve pre-designable pore size and geometry; however, pore surface engineering in COFs remains challenging. Here we introduce pore surface engineering to COF chemistry, which allows the controlled functionalization of COF pore walls with organic groups. This functionalization is made possible by the use of azide-appended building blocks for the synthesis of COFs with walls to which a designable content of azide units is anchored. The azide units can then undergo a quantitative click reaction with alkynes to produce pore surfaces with desired groups and preferred densities. The diversity of click reactions performed shows that the protocol is compatible with the development of various specific surfaces in COFs. Therefore, this methodology constitutes a step in the pore surface engineering of COFs to realize pre-designed compositions, components and functions.
authors.affiliation: Department of Materials Molecular Science, Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Nagai
authors.forename: Zhaoqi
authors.initials: Z
authors.lastname: Guo
authors.forename: Xiao
authors.initials: X
authors.lastname: Feng
authors.forename: Shangbin
authors.initials: S
authors.lastname: Jin
authors.forename: Xiong
authors.initials: X
authors.lastname: Chen
authors.forename: Xuesong
authors.initials: X
authors.lastname: Ding
authors.forename: Donglin
authors.initials: D
authors.lastname: Jiang
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