American Chemical Society
ja8b13888_si_001.pdf (5.53 MB)

Amphiphilic Cyclodextrin-Based Liquid Crystals for Proton Conduction

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journal contribution
posted on 2019-05-22, 00:00 authored by Pier-Luc Champagne, David Ester, Danielle Polan, Vance E. Williams, Venkataraman Thangadurai, Chang-Chun Ling
Novel cyclodextrin (CD)-based amphiphilic poly­(carboxylic acid)­s that self-assemble into highly ordered smectic liquid crystalline mesophases were investigated as a novel class of protonic conductors. These structurally well-defined materials are synthesized from nontoxic and environment-friendly CDs, which possess a unique face-to-face pseudosymmetry. By taking advantage of such geometry, a series of flexible tetraethylene glycol groups terminated with a carboxylic acid functionality were introduced to the CD’s secondary face, resulting in the formation of long-range 2D hydrogen-bond networks in the smectic mesophases over a wide temperature window. This new material was found to exhibit impressive proton conductivities in solid states, up to 1.4 × 10–2 S cm–1 at 70 °C and 95% humidity. This constitutes the first report of amphiphilic CD-based liquid crystals applied as proton conductive materials.