Insight into Ion Transfer through the Sub-Nanometer Channels in Zeolitic Imidazolate Frameworks.
Angew Chem Int Ed Engl
; 56(17): 4767-4771, 2017 04 18.
Article
in En
| MEDLINE
| ID: mdl-28345204
A crack-free sub-nanometer composite structure for the study of ion transfer was constructed by inâ
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 (pHâ
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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Angew Chem Int Ed Engl
Year:
2017
Document type:
Article
Country of publication:
Alemania