Spontaneous Mirror-Symmetry Breaking in Isotropic Liquid Phases of Photoisomerizable Achiral Molecules.
Spontaneous mirror-symmetry breaking is of fundamental importance in science as it contributes to the development of chiral superstructures and new materials and has a major impact on the discussion around the emergence of uniform chirality in biological systems. Herein we report chirality synchronization, leading to spontaneous chiral conglomerate formation in isotropic liquids of achiral and photoisomerizable azobenzene-based rod-like molecules. The position of fluorine substituents at the aromatic core is found to have a significant effect on the stability and the temperature range of these chiral liquids. Moreover, these liquid conglomerates occur in a new phase sequence adjacent to a 3D tetragonal mesophase.
Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, 06120 Halle/Saale (Germany). malaasar@sci.cu.edu.eg.|Department of Chemistry, Faculty of Science, Cairo University, P.O. 12613 Giza (Egypt). malaasar@sci.cu.edu.eg.
Mohamed
M
Alaasar
Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, 06120 Halle/Saale (Germany).
Marko
M
Prehm
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (P. R. China).
Yu
Y
Cao
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 (P. R. China). feng.liu@mail.xjtu.edu.cn.
Feng
F
Liu
Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, 06120 Halle/Saale (Germany). carsten.tschierske@chemie.uni-halle.de.
Carsten
C
Tschierske
azo compounds; chirality; liquids; self-assembly; symmetry breaking