Carbon-Nanotube-Mediated Electrochemical Transition in a Redox-Active Supramolecular Hydrogel Derived from Viologen and an L-Alanine-Based Amphiphile

Datta, Sougata and Bhattacharya, Santanu (2016) Carbon-Nanotube-Mediated Electrochemical Transition in a Redox-Active Supramolecular Hydrogel Derived from Viologen and an L-Alanine-Based Amphiphile. In: CHEMISTRY-A EUROPEAN JOURNAL, 22 (22). pp. 7524-7532.

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Abstract

A two-component hydrogelator (16-A)(2)-V2+, comprising an l-alanine-based amphiphile (16-A) and a redox-active viologen based partner (V2+), is reported. The formation the hydrogel depended, not only on the acid-to-amine stoichiometric ratio, but on the choice of the l-amino acid group and also on the hydrocarbon chain length of the amphiphilic component. The redox responsive property and the electrochemical behavior of this two-component system were further examined by step-wise chemical and electro-chemical reduction of the viologen nucleus (V2+/V+ and V+/V-0). The half-wave reduction potentials (E-1/2) associated with the viologen ring shifted to more negative values with increasing amine component. This indicates that higher extent of salt formation hinders reduction of the viologen moiety. Interestingly, the incorporation of single-walled carbon nanotubes in the electrochemically irreversible hydrogel (16-A)(2)-V2+ transformed it into a quasi-reversible electrochemical system.

Item Type:	Journal Article
Publication:	CHEMISTRY-A EUROPEAN JOURNAL
Publisher:	WILEY-V C H VERLAG GMBH
Additional Information:	Copy right for this article belongs to the WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
Keywords:	charge transfer; cyclic voltammetry; nanocomposite; redox-active hydrogel; self-assembly
Department/Centre:	Division of Chemical Sciences > Organic Chemistry
Date Deposited:	24 Aug 2016 09:17
Last Modified:	24 Aug 2016 09:17
URI:	http://eprints.iisc.ac.in/id/eprint/54499

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