Supramolecular Gating of Ion Transport in Nanochannels

Kumar, Pavan BVVS and Rao, Venkata K and Sampath, S and George, Subi J and Eswaramoorthy, Muthusamy (2014) Supramolecular Gating of Ion Transport in Nanochannels. In: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 53 (48). pp. 13073-13077.

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Abstract

Several covalent strategies towards surface charge-reversal in nanochannels have been reported with the purpose of manipulating ion transport. However, covalent routes lack dynamism, modularity and post-synthetic flexibility, and hence restrict their applicability in different environments. Here, we introduce a facile non-covalent approach towards charge-reversal in nanochannels (< 10 nm) using strong charge-transfer interactions between dicationic viologen (acceptor) and trianionic pyranine (donor). The polarity of ion transport was switched from anion selective to ambipolar to cation selective by controlling the extent of viologen bound to the pyranine. We could also regulate the ion transport with respect to pH by selecting a donor with pH-responsive functional groups. The modularity of this approach further allows facile integration of various functional groups capable of responding to stimuli such as light and temperature to modulate the transport of ions as well as molecules.

Item Type:	Journal Article
Publication:	ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Publisher:	WILEY-V C H VERLAG GMBH
Additional Information:	Copyright for this article belongs to the WILEY-V C H VERLAG GMBH, BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
Keywords:	charge-transfer; electrostatic gating; ion-selective channels; mesoporous materials; supramolecular chemistry
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	12 Jan 2015 05:08
Last Modified:	12 Jan 2015 05:08
URI:	http://eprints.iisc.ac.in/id/eprint/50570

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