Rewriting the phase diagram of a diamagnetic liquid crystal by a magnetic field

Fatin Hajjaj, Takashi Kajitani, Hiroyuki Ohsumi, Yoshikazu Tanaka, Kenichi Kato, Masaki Takata, Hideaki Kitazawa, Taka-hisa Arima, Takuzo Aida () and Takanori Fukushima ()
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Fatin Hajjaj: Tokyo Institute of Technology
Takashi Kajitani: Tokyo Institute of Technology
Hiroyuki Ohsumi: RIKEN SPring-8 Center
Yoshikazu Tanaka: RIKEN SPring-8 Center
Kenichi Kato: RIKEN SPring-8 Center
Masaki Takata: RIKEN SPring-8 Center
Hideaki Kitazawa: National Institute for Materials Science
Taka-hisa Arima: The University of Tokyo
Takuzo Aida: RIKEN Center for Emergent Matter Science (CEMS)
Takanori Fukushima: Tokyo Institute of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Magnetic fields have been considered to only interact with organic materials non-destructively, leaving their fundamental structures unaffected, even when a strong magnetic field generated from a superconducting magnet is applied. Here we report an unprecedented observation that a liquid-crystalline mesophase of a diamagnetic molecular assembly with an orthorhombic or a cubic structure is formed selectively in the absence or presence of a strong magnetic field. The constituent molecule is a triphenylene derivative carrying six imidazolium bromide-terminated alkyl side chains and exhibits a cubic, orthorhombic, or hexagonal columnar mesophase when complexed with an appropriate amount of lanthanum(III) bromide. Thermal processing of the La3+-containing liquid-crystalline assembly in the presence of a 10-tesla magnetic field resulted in a phase diagram, in which the orthorhombic phase is completely replaced with the cubic phase. The discovery of this magneto-induced phase-selection offers an insight into the interactions between magnetic fields and organic material.

Date: 2018
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DOI: 10.1038/s41467-018-06976-7

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