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Title: Observation of positive and negative magneto-LC effects in all-organic nitroxide radical liquid crystals by EPR spectroscopy
Authors: Suzuki, Katsuaki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0001-8042-9517 (unconfirmed)
Uchida, Yoshiaki
Tamura, Rui  kyouindb  KAKEN_id
Shimono, Satoshi
Yamauchi, Jun
Author's alias: 田村, 類
Issue Date: 27-Feb-2012
Publisher: Royal Society of Chemistry
Journal title: Journal of Materials Chemistry
Volume: 22
Start page: 6799
End page: 6806
Abstract: The generation of spin glass-like inhomogeneous magnetic interactions (the average spin–spin interaction constant: [J with combining macron] > 0 or [J with combining macron] < 0), which we refer to as positive or negative “magneto-LC effects”, respectively, was observed in the bulk liquid crystalline (LC) phases of chiral all-organic radical compounds 2 with a positive dielectric anisotropy (Δε > 0) under weak magnetic fields. The sign and magnitude of [J with combining macron] depended on the type of LC phase or superstructure; stronger positive interactions ([J with combining macron] > 0) operated in the chiral smectic A (SmA*) phase of (2S, 5S)-2b (89% ee) than in the chiral nematic (N*) phase of (2S, 5S)-2a (96% ee), whereas weak negative interactions ([J with combining macron] < 0) were observed in the achiral nematic (N) phase of (±)-2a. The origin of the positive magneto-LC effects operating in the SmA* and N* phases was interpreted in terms of the generation of ferromagnetic head-to-tail spin–spin dipole interactions, whereas antiferromagnetic interactions arising from the formation of the RS magnetic dipolar interaction were responsible for the negative magneto-LC effects in the N phase.
Rights: © The Royal Society of Chemistry 2012
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/169678
DOI(Published Version): 10.1039/c2jm16278d
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