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Effect of Dipole Functionalization on the Thermodynamics and Dynamics of Discotic Liquid Crystals

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Nino Haase‡, Christos Grigoriadis†, Hans-Jurgen Butt‡, Klaus Müllen*‡, and George Floudas*†

^† Department of Physics, University of Ioannina, 451 10 Ioannina, Greece and Foundation for Research and Technology-Hellas, Biomedical Research Institute (FORTH-BRI), Ioannina, Greece

^‡ Max-Planck Institute for Polymer Research, 55128 Mainz, Germany

J. Phys. Chem. B, 2011, 115 (19), pp 5807–5814

DOI: 10.1021/jp201552h

Publication Date (Web): April 25, 2011

*E-mail: gfloudas@cc.uoi.gr (G.F.), muellen@mpip-mainz.mpg.de (K.M.). Phone: +30-2651-008564. Fax: +30-2651-009693.

Section:

Crystallography and Liquid Crystals

Abstract

The effect of dipole substitution on the self-assembly, thermodynamics, and dynamics has been studied in a series of hexa-peri-hexabenzocoronenes (HBCs). The HBCs bear the same number and type of aliphatic chains, but different dipoles directly attached to the cores ranging from 0 to 3.4 D. Dipole substitution alters the energetics and reduces the transition temperature favoring the columnar hexagonal liquid crystalline phase at the expense of the crystalline phase. The equation of state was obtained by independent pressure–volume–temperature measurements in both phases that resulted in the equilibrium phase diagram. According to the latter, increasing pressure imparts stability to the crystalline phase. The molecular and supramolecular dynamics investigated, respectively, by dielectric spectroscopy and rheology, identified a hierarchy of motions comprising a fast axial motion, a slower process that completely relaxes the dipole moment, and an even slower soliton-like relaxation of structural defects.

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Dynamics of Structure Formation in a Discotic Liquid Crystal by Infrared Spectroscopy and Related Techniques
Periklis Papadopoulos, Christos Grigoriadis, Nino Haase, Hans-Jurgen Butt, Klaus Müllen, and George Floudas
The Journal of Physical Chemistry B2011 115 (50), 14919-14927
- Dynamics of Structure Formation in a Discotic Liquid Crystal by Infrared Spectroscopy and Related Techniques
  Periklis Papadopoulos, Christos Grigoriadis, Nino Haase, Hans-Jurgen Butt, Klaus Müllen, and George Floudas
  The Journal of Physical Chemistry B2011 115 (50), 14919-14927
  The dynamics of the herringbone structure formation have been studied in a monobromo hexa-peri-hexabenzocoronene derivative by infrared spectroscopy and complementary techniques. Selective probing of the vibration modes corresponding to the aromatic core ...
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