Supramolecular Surface Charge Regulation in Ionic Covalent Organic Nanosheets: Reversible Exfoliation and Controlled Bacterial Growth

Autor: K B S Dileep Kumar, Rakesh Mishra, Jubi Jacob, Samiyappan Vijayakumar, Ayyappanpillai Ajayaghosh, Arindam Mal, Renjith S. Pillai
Rok vydání: 2019
Předmět:
Zdroj: Angewandte Chemie International Edition. 59:8713-8719
ISSN: 1521-3773
1433-7851
DOI: 10.1002/anie.201912363
Popis: 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.
Databáze: OpenAIRE
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