3 years ago

Three-dimensional anionic cyclodextrin-covalent organic frameworks

Haiwei Li, Junwen Zhou, Bo Wang, Dou Ma, Xiaojie Ma, Siwu Li, Jiyun Duan, Pengfei Li, Yuanyuan Zhang, Xiao Feng
Three-dimensional covalent organic frameworks (3D COFs) are promising crystalline materials with well-defined structures, high porosity and low density; however, the limited choice of building blocks and synthetic difficulties have dampened their development. Here, we embark on a flexible and aliphatic macrocycle, γ-cyclodextrin (γ-CD), as the soft struts to construct polymeric and periodic 3D extended network where the units are joined by tetrakis(spiroborate) tetrahedra with tunable counter ions. The inclusion of pliable moiety in the robust open framework endows these CD-COFs with dynamic feature leading to a prominent Li-ion conductivity up to 2.7 mS cm-1 at 30 ºC and excellent long-term Li-ion stripping/plating stability. Further altering the counter ions within the pores can effectively modulate the interactions between CD-COFs and CO₂ molecules.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201710633

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