Next Article in Journal
Atomic Structure of Decagonal Al-Cu-Rh Quasicrystal–Revisited: New Correction for Phonons
Next Article in Special Issue
Decreasing the Residual DC Voltage by Neutralizing the Charged Mobile Ions in Liquid Crystals
Previous Article in Journal
A Magnetocaloric Booster Unit for Energy-Efficient Air-Conditioning
Previous Article in Special Issue
Improved Electronic Transport in Ion Complexes of Crown Ether Based Columnar Liquid Crystals
Article

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

Department of Chemistry and Biochemistry, University of Nevada Las Vegas, 4505 S. Maryland Parkway, Box 454003, Las Vegas, NV 89154, USA
*
Author to whom correspondence should be addressed.
This article is dedicated to the memory of Dr. Ananda M. Sarker (1952–2018): deceased on 30 August 2018.
Crystals 2019, 9(2), 77; https://doi.org/10.3390/cryst9020077
Received: 28 December 2018 / Revised: 26 January 2019 / Accepted: 28 January 2019 / Published: 1 February 2019
(This article belongs to the Special Issue Ionic Liquid Crystals)
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. View Full-Text
Keywords: viologens; 4-n-alkylbenzenesulfonic acids; metathesis reaction; ionic liquid crystals; thermotropic; smectic phase A; differential scanning calorimetry; polarizing optical microscopy; thermogravimetric analysis viologens; 4-n-alkylbenzenesulfonic acids; metathesis reaction; ionic liquid crystals; thermotropic; smectic phase A; differential scanning calorimetry; polarizing optical microscopy; thermogravimetric analysis
Show Figures

Graphical abstract

MDPI and ACS Style

Bhowmik, P.K.; Chang, A.; Kim, J.; Dizon, E.J.; Principe, R.C.G.; Han, H. Thermotropic Liquid-Crystalline Properties of Viologens Containing 4-n-alkylbenzenesulfonates. Crystals 2019, 9, 77. https://doi.org/10.3390/cryst9020077

AMA Style

Bhowmik PK, Chang A, Kim J, Dizon EJ, Principe RCG, Han H. Thermotropic Liquid-Crystalline Properties of Viologens Containing 4-n-alkylbenzenesulfonates. Crystals. 2019; 9(2):77. https://doi.org/10.3390/cryst9020077

Chicago/Turabian Style

Bhowmik, Pradip K., Anthony Chang, Jongin Kim, Erenz J. Dizon, Ronald C.G. Principe, and Haesook Han. 2019. "Thermotropic Liquid-Crystalline Properties of Viologens Containing 4-n-alkylbenzenesulfonates" Crystals 9, no. 2: 77. https://doi.org/10.3390/cryst9020077

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop