Issue 9, 2014

Zwitterionic pyridinium derivatives of [closo-1-CB9H10] and [closo-1-CB11H12] as high Δε additives to a nematic host

Abstract

Substituted closo-carbaborate–pyridinium zwitterions were prepared in 35–50% yield by reacting 1-amino-closo-1-carbaborates with 4-alkoxypyrylium triflates. Two of the new materials, 1[6]d and 2[10]b, exhibit a high temperature SmA phase, whose stability is driven by dipolar interactions. Solution studies in a nematic host, ClEster, demonstrated high positive dielectric anisotropy of these new compounds (Δε ≈ +50) resulting from a longitudinal molecular dipole moment of about 20 D.

Graphical abstract: Zwitterionic pyridinium derivatives of [closo-1-CB9H10]− and [closo-1-CB11H12]− as high Δε additives to a nematic host

Supplementary files

Article information

Article type
Communication
Submitted
28 Nov 2013
Accepted
17 Dec 2013
First published
24 Jan 2014
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2014,2, 1585-1591

Author version available

Zwitterionic pyridinium derivatives of [closo-1-CB9H10] and [closo-1-CB11H12] as high Δε additives to a nematic host

J. Pecyna, D. Pociecha and P. Kaszyński, J. Mater. Chem. C, 2014, 2, 1585 DOI: 10.1039/C3TC32351J

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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