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Tailoring liquid crystal honeycombs by head-group choice in bird-like bent-core mesogens

DOI: 10.1039/D0TC01879A DOI Help

Authors: Ya-Xin Li (Xi’an Jiaotong University) , Huifang Cheng (Yunnan University) , Xiangbing Zeng (University of Sheffield) , Yuan Tao (Yunnan University) , Xiaohong Cheng (Yunnan University; Yangtze Normal University) , Goran Ungar (Xi’an Jiaotong University; University of Sheffield)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Materials Chemistry C , VOL 106

State: Published (Approved)
Published: May 2020

Open Access Open Access

Abstract: We introduce a new class of mesogens that are bird-like in shape and form honeycomb-type supramolecular liquid crystals. They have a bent pi-conjugated aromatic core as wings, a linear or branched chain as the tail and a selection of functional headgroups. Honeycombs of non-centrosymmetric trigonal type (p3m1) are obtained, along with two different complex honeycomb superlattices (p31m and p2gg) and a randomized hexagonal mesophase (p6mm). The key determinant of the self-assembled structure is the nature of interaction of the headgroup with the glycerols at the ends of the wings. The structure depends on whether the sub-columns lying along the edges of the prismatic cells contain pure or mixed headgroups and wing-end hydrogen-bonding groups. Its assembly is further controlled by reducing the tail-chain volume, inducing out-of-plane buckling of the honeycomb. These two modes of symmetry breaking lead to structural polarity both in- and out-of-plane, opening the way to applications in devices relying on properties such as ferroelectricity and second harmonic generation.

Subject Areas: Materials, Chemistry

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

Added On: 28/05/2020 14:49


Discipline Tags:

Molecular Complexes Chemistry Materials Science

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)