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Int. J. Mol. Sci. 2014, 15(4), 5634-5648; doi:10.3390/ijms15045634

Liquid Crystalline Assembly of Coil-Rod-Coil Molecules with Lateral Methyl Groups into 3-D Hexagonal and Tetragonal Assemblies

1
Key Laboratory for Organism Resources of the Changbai Mountain and Functional Molecules, Department of Chemistry, College of Science, Yanbian University, No.977 Gongyuan Road, Yanji 133002, China
2
College of Chemistry, Chemical Engineering and Food Safety, Bohai University, Jinzhou 121013, China
3
Beijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 16 October 2013 / Revised: 3 March 2014 / Accepted: 11 March 2014 / Published: 2 April 2014
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Abstract

In this paper, we report the synthesis and self-assembly behavior of coil-rod-coil molecules, consisting of three biphenyls linked through a vinylene unit as a conjugated rod segment and poly(ethylene oxide) (PEO) with a degree of polymerization (DP) of 7, 12 and 17, incorporating lateral methyl groups between the rod and coil segments as the coil segment. Self-organized investigation of these molecules by means of differential scanning calorimetry (DSC), thermal polarized optical microscopy (POM) and X-ray diffraction (XRD) reveals that the lateral methyl groups attached to the surface of rod and coil segments, dramatically influence the self-assembling behavior in the liquid-crystalline mesophase. Molecule 1 with a relatively short PEO coil length (DP = 7) self-assembles into rectangular and oblique 2-dimensional columnar assemblies, whereas molecules 2 and 3 with DP of 12 and 17 respectively, spontaneously self-organize into unusual 3-dimensional hexagonal close-packed or body-centered tetragonal assemblies. View Full-Text
Keywords: coil-rod-coil; self-assembly; columnar; hexagonal; tetragonal; small angle X-ray scattering (SAXS) coil-rod-coil; self-assembly; columnar; hexagonal; tetragonal; small angle X-ray scattering (SAXS)
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Wang, Z.; Lan, Y.; Zhong, K.; Liang, Y.; Chen, T.; Jin, L.Y. Liquid Crystalline Assembly of Coil-Rod-Coil Molecules with Lateral Methyl Groups into 3-D Hexagonal and Tetragonal Assemblies. Int. J. Mol. Sci. 2014, 15, 5634-5648.

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