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β‐Cyclodextrin Covalent Organic Framework for Selective Molecular Adsorption
Author(s) -
Wang RenQi,
Wei XueBing,
Feng YuQi
Publication year - 2018
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201802564
Subject(s) - covalent bond , adsorption , covalent organic framework , thermal stability , polymer , cyclodextrin , reagent , chemistry , non covalent interactions , chemical engineering , molecule , materials science , organic chemistry , hydrogen bond , engineering
Covalent organic frameworks (COF) are complex functional systems constructed with atomic precision by linking well‐defined building blocks through robust covalent bonds. β‐cyclodextrin (β‐CD) is a most employed supramolecule which bears a hydrophobic cavity guiding molecular specific recognitions. Building COF with asymmetric β‐CD linkers is challenging and has never been reported. Here, β‐CD COF is grown with heptakis(6‐amino‐6‐deoxy)‐β‐CD and terephthalaldehyde in green solvents of water and ethanol at room temperature. The COF is characterized by powder X‐ray diffraction, which matches well with the simulated crystal structure. Weaving β‐CD into a framework through reticular chemistry allows the integration of a large amount of β‐CD units (50 mol %), much higher than β‐CD polymers. The β‐CD COF has larger surface area, more uniform pore size, and higher thermal stability than the non‐crystalline β‐CD polymer produced by the same reagents. Finally, the β‐CD COF holds abundant specific interaction sites enabling selective molecular adsorption.