Insight into Ion Transfer through the Sub‐Nanometer Channels in Zeolitic Imidazolate Frameworks

A crack‐free sub‐nanometer composite structure for the study of ion transfer was constructed by in situ growth of ZIF‐90 [Zn(ICA)2, ICA=Imidazole‐2‐carboxaldehyde] on the tip of a glass nanopipette. The potential‐driven ion transfer through the sub‐nanometer channels in ZIF‐90 is strongly influenced...

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Bibliographic Details
Published in:Angewandte Chemie 2017-04, Vol.129 (17), p.4845-4849
Main Authors: Jiang, Ze‐Yu, Liu, Hai‐Ling, Ahmed, Saud Asif, Hanif, Sumaira, Ren, Shi‐Bin, Xu, Jing‐Juan, Chen, Hong‐Yuan, Xia, Xing‐Hua, Wang, Kang
Format: Article
Language:eng ; ger
Subjects:
Channels
Chemistry
Chlorides
Composite structures
Crack propagation
Electrostatic properties
Electrostatics
Fluorescence
Gleichrichtung
Imidazole
Ionentransport
Metal-organic frameworks
Nanoporenanalyse
Nanostructure
pH effects
Porosity
Potassium chloride
Rectification
Salts
Zeolithische Imidazolat-Gerüste
ZIF-90
Zinc
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Summary:A crack‐free sub‐nanometer composite structure for the study of ion transfer was constructed by in situ growth of ZIF‐90 [Zn(ICA)2, ICA=Imidazole‐2‐carboxaldehyde] on the tip of a glass nanopipette. The potential‐driven ion transfer through the sub‐nanometer channels in ZIF‐90 is strongly influenced by the pH of the solution. A rectification ratio over 500 is observed in 1 m KCl solution under alkaline conditions (pH 11.58), which is the highest value reported under such a high salt concentration. Fluorescence experiments show the super‐high rectification ratio under alkaline conditions results from the strong electrostatic interaction between ions and the sub‐nanometer channels of ZIF‐90. In addition to providing a general pathway for further study of mass‐transfer process through sub‐nanometer channels, the approach enable all kinds of metal–organic frameworks (MOFs) to be used as ionic permselectivity materials in nanopore‐based analysis. Spitzenleistung: Die Beschichtung einer Nanopipettenspitze mit dem kristallinen zeolithischen Imidazolat‐Gerüst ZIF‐90 führt zu einer hochgradigen Gleichrichtung des Ionenstroms. Die Ursache für dieses Phänomen sind Wechselwirkungen zwischen den Subnanometerkanälen in ZIF‐90 auf der Glas‐Nanopipette (GNS‐ZIF‐90) und Ionen in Lösung.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201701279