Mal, Arindam ; Vijayakumar, Samiyappan ; Mishra, Rakesh K. ; Jacob, Jubi ; Pillai, Renjith S. ; Dileep Kumar, B. S. ; Ajayaghosh, Ayyappanpillai (2019) Supramolecular Surface Charge Regulation in Ionic Covalent Organic Nanosheets: Reversible Exfoliation and Controlled Bacterial Growth Angewandte Chemie International Edition, 59 (22). pp. 8713-8719. ISSN 1433-7851
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Official URL: http://doi.org/10.1002/anie.201912363
Related URL: http://dx.doi.org/10.1002/anie.201912363
Abstract
Poor control on the exfoliation of covalent organic frameworks (COFs) remains a disadvantage for their application as two-dimensional nanosheets. An equally important problem is the reversible control at the available surface charges on COFs. Herein, a strategy for the reversible exfoliation, re-stacking, and surface-charge control of a propidium iodide based ionic covalent organic framework, PI-TFP, using cucurbit[7]uril (CB[7]) induced molecular recognition, is reported. The surface charge on PI-TFP facilitates its initial self-exfoliation. However, complexation with CB[7] resulted in re-stacking with concomitant decrease in zeta potential from +28±3.0 to +0.004±0.003 mV. Addition of 1-adamantylamine hydrochloride (AD) facilitates decomplexation of PI-TFP from CB[7], resulting in exfoliation and an increase in zeta potential to +24±3.0 mV. Such control on the exfoliation, re-stacking, and the associated regulation of the surface charge in PI-TFP was exploited for controlling bacterial growth. Thus, the activity of E. coli and S. aureus bacteria obtained with the self-exfoliated PI-TFP could be reversibly controlled by the CB[7]/AD pair.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley & Sons, Inc. |
ID Code: | 129929 |
Deposited On: | 28 Nov 2022 11:25 |
Last Modified: | 28 Nov 2022 11:25 |
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