Self-assembled structures formed by a wedge-shaped molecule in 2D and 3D: the role of flexible side chains and polar head groups

Physical Chemistry Chemical Physics : PCCP
Xiaomin ZhuDimitri A Ivanov

Abstract

A wedge-shaped amphiphilic molecule, 3,4,5-tridodecyloxycinnamic acid, was used as a model system to explore the role of different constitutive elements of the chemical structure in the formation of 2D and 3D self-assemblies. The polar heads forming cyclic hydrogen-bonded dimers determine the two largest unit cell parameters, which depend only slightly on the dimensionality of the system (i.e. 2D versus 3D) and on the sample thermal history. By contrast, the structure of the alkyl side chains is very sensitive to the phase transformations, and is likely to be responsible for the rich polymorphic behaviour of the studied compound. Thus, in the monotropic SmC phase, the alkyl chains form a liquid-crystalline sub-lattice with hexagonal symmetry that can further crystallize either in a triclinic sub-cell (metastable crystalline phase) or in an orthorhombic sub-cell (stable crystalline phase). In 2D, at the interface with the graphite surface the molecular orientation is guided by the epitaxy. Although the largest lattice parameters are close to those in the bulk, the alkyl chains adopt a particular alternating orientation. In one molecule of the dimer, two alkyl chains have their molecular planes parallel to the substrate while the...Continue Reading

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Citations

Oct 6, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Elena V AginaSergei A Ponomarenko
Oct 16, 2010·Physical Chemistry Chemical Physics : PCCP·Simone Fabiano, Bruno Pignataro
May 20, 2011·Current Eye Research·Zhongxia ZhuAchim Langenbucher
Sep 15, 2010·Journal of Pharmaceutical Sciences·Dritan HasaSergio Invernizzi
Jan 26, 2013·Chemistry : a European Journal·Martin RosenthalMartin Möller
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Oct 28, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Jānis LejnieksDimitri A Ivanov
Nov 25, 2017·Chemical Communications : Chem Comm·K N GrafskaiaD A Ivanov

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