Synthesis of low-order liquid-crystalline viologens and their photo-responsive behavior

Yumiko Naka; Khoa V. Le; Takeo Sasaki

doi:10.1117/12.3000664

13 March 2024 Synthesis of low-order liquid-crystalline viologens and their photo-responsive behavior

Yumiko Naka, Khoa V. Le, Takeo Sasaki

Proceedings Volume 12907, Emerging Liquid Crystal Technologies XIX; 1290703 (2024) https://doi.org/10.1117/12.3000664
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Viologens that exhibit a low-order liquid-crystalline (LC) phase at ambient temperatures can be used photo-sensitive moieties in LC materials. We synthesized viologens having an asymmetric core, while maintaining its stimulusresponsive properties, with the aim of forming a low order LC phase at ambient temperature. The obtained viologens having an asymmetric core exhibited low-order LC phases with no regularity in the direction of the molecular short axis. Furthermore, we synthesized a viologen derivative having a symmetric core. We found that the development of loworder LC phases was observed, when the rod core was asymmetried by changing the position and number of ionic bonds. It was suggested that the intermolecular interactions were weakened by varying the position of the ionic bonding sites to asymmetrize the core. The photo-responsive behavior of the viologen having an asymmetric core was investigated. The viologen having an asymmetric core was mixed with the nematic LC compound (5CB and 7OCB) to prepare homogeneously aligned films. The change in the alignment of the mesogens was successfully induced by triggering a one-electron reduction reaction of the viologen moieties by light irradiation.

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(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yumiko Naka, Khoa V. Le, and Takeo Sasaki "Synthesis of low-order liquid-crystalline viologens and their photo-responsive behavior", Proc. SPIE 12907, Emerging Liquid Crystal Technologies XIX, 1290703 (13 March 2024); https://doi.org/10.1117/12.3000664

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