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Supertwisted chiral gyroid mesophase in chiral rod-like compounds

DOI: 10.1002/anie.202403156 DOI Help

Authors: Yan Wang (Xi'an Jiaotong University) , Shu-Gui Yang (Xi'an Jiaotong University) , Ya-Xin Li (Henan University of Technology) , Yu Cao (Xi'an Jiaotong University) , Feng Liu (Xi'an Jiaotong University) , Xiang-Bing Zeng (University of Sheffield) , Liliana Cseh (Institute of Chemistry Timisoara of Romanian Academy, Dragulescu Institute of Chemistry) , Goran Ungar (University of Sheffield)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Angewandte Chemie International Edition

State: Published (Approved)
Published: April 2024
Diamond Proposal Number(s): 29045

Open Access Open Access

Abstract: Among the intriguing bicontinuous self-assembled structures, the gyroid cubic is the most ubiquitous. It is found in block and star polymers, surfactants with or without solvent, in thermotropic liquid crystals with end- or side-chains, and in biosystems providing structural color and modelling cell mitosis. It contains two interpenetrating networks of opposite chirality and is thus achiral if, as usual, the content of the two nets is the same. But we now find that this is not the case for strongly chiral compounds. While achiral molecules follow the opposite twists of nets 1 and 2, molecules with a chiral center in their rod-like core fail to follow the 70° twist between junctions in net 2 and instead wind against it by -110° to still match the junction orientation. The metastable chiral gyroid is a high-entropy high-heat-capacity mesophase. The homochirality of its nets makes the CD signal of the thienofluorenone compounds close to that in the stable I23 phase with 3 isochiral nets.

Journal Keywords: Liquid crystals; polycatenar; circular dichroism; depolarized fluorescence; thienofluorenone

Subject Areas: Materials, Chemistry


Instruments: B23-Circular Dichroism , I22-Small angle scattering & Diffraction

Other Facilities: BL16B1 at SSRF

Added On: 04/04/2024 10:00

Documents:
Angew Chem Int Ed - 2024 - Wang - Supertwisted Chiral Gyroid Mesophase in Chiral Rod%E2%80%90like Compounds.pdf

Discipline Tags:

Chemistry Materials Science Organic Chemistry Polymer Science

Technical Tags:

Scattering Spectroscopy Small Angle X-ray Scattering (SAXS) Wide Angle X-ray Scattering (WAXS) Circular Dichroism (CD)