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New type of columnar liquid crystal superlattice in double‐taper ionic minidendrons

DOI: 10.1002/chem.201902639 DOI Help

Authors: Ya-Xin Li (University of Sheffield) , Fang-Fang Fan (Zhejiang Sci-Tech University) , Jie Wang (Zhejiang Sci-Tech University; Xi’an Jiaotong University) , Liliana Cseh (Xi’an Jiaotong University; “Coriolan Dragulescu” Institute of Chemistry) , Min Xue (Zhejiang Sci-Tech University) , Xiang-Bing Zeng (University of Sheffield) , Goran Ungar (Xi’an Jiaotong University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry – A European Journal

State: Published (Approved)
Published: July 2019

Abstract: Wedge‐shaped molecules, such as dendrons, are among the most important building blocks for directed supramolecular self‐assembly. Here we present a new approach aimed at widening the range and complexity of potential mesophases by introducing double‐tapered mesogens. Two series of compounds are presented, both alkali metal salts (Li, Na, Cs) of 3,4,5‐tris‐alkoxybenzoic acid with a second tapered tris‐alkoxyaryl group attached at the end of an alkoxy chain. The double‐tapered compounds all display an unusual hexagonal columnar phase consisting of one ionic and three non‐ionic columns per unit cell. The cation size has an unexpectedly drastic effect on unit cell size. Unlike most columnars, the current phases show unusually high dimensional stability on heating, and high stiffness in spite of being 80‐85% aliphatic, attributed to their molecular topology. The described approach may lead to co‐assemblies of multifunctional materials, e.g. parallel p‐ and n‐semiconducting nanowires or parallel ionic and electronic conductors.

Journal Keywords: Dendrimers; GISAXS; Liquid crystals; Self-assembly; X-ray diffraction

Subject Areas: Chemistry, Physics


Instruments: I16-Materials and Magnetism , I22-Small angle scattering & Diffraction

Added On: 08/08/2019 14:01

Discipline Tags:

Surfaces Physics Physical Chemistry Chemistry interfaces and thin films Organic Chemistry

Technical Tags:

Scattering Small Angle X-ray Scattering (SAXS) Wide Angle X-ray Scattering (WAXS) Grazing Incidence Small Angle Scattering (GISAXS) Grazing Incidence Wide Angle Scattering (GIWAXS)