Thermotropic Liquid-Crystalline Properties of Viologens Containing 4-n-alkylbenzenesulfonates†

Authors

Pradip K. Bhowmik, University of Nevada, Las VegasFollow
Anthony Chang, University of Nevada, Las VegasFollow
Jongin Kim, University of Nevada, Las VegasFollow
Erenz J. Dizon, University of Nevada, Las VegasFollow
Ronald Carlo G. Principe, University of Nevada, Las VegasFollow
Haesook Han, University of Nevada, Las VegasFollow

Document Type

Article

Publication Date

2-1-2019

Publication Title

Crystals

Publisher

MDPI

Volume

9

Issue

2

First page number:

1

Last page number:

13

Abstract

A series of viologens containing 4-n-alkylbenzenesulfonates were synthesized by the metathesis reaction of 4-n-alkylbenzenesulfonic acids or sodium 4-n-alkylbezenesulfonates with the respective viologen dibromide in alcohols. Their chemical structures were characterized by Fourier Transform Infrared, ¹H and ¹³C Nuclear Magnetic Resonance spectra and elemental analysis. Their thermotropic liquid-crystalline (LC) properties were examined by differential scanning calorimetry and polarizing optical microscopy. They formed LC phases above their melting transitions and showed isotropic transitions. As expected, all the viologen salts had excellent stabilities in the temperature range of 278–295 °C as determined by thermogravimetric analysis.

Keywords

Viologens; 4-n-alkylbenzenesulfonic acids; Metathesis reaction; Ionic liquid crystals; Thermotropic; Smectic phase A; Differential scanning calorimetry; Polarizing optical microscopy; Thermogravimetric analysis

Disciplines

Chemistry

File Format

pdf

File Size

2917 KB

Language

English

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.

Repository Citation

Bhowmik, P. K., Chang, A., Kim, J., Dizon, E. J., Principe, R. C., Han, H. (2019). Thermotropic Liquid-Crystalline Properties of Viologens Containing 4-n-alkylbenzenesulfonates†. Crystals, 9(2), 1-13. MDPI.
http://dx.doi.org/10.3390/cryst9020077