Unique Superparamagnetic‐like Behavior Observed in Non‐π‐delocalized Nitroxide Diradical Compounds Showing Discotic Liquid Crystalline Phase

A unique superparamagnetic‐like behavior and a large “positive magneto‐LC effect” were observed in the solid phases and the hexagonal columnar (Colh) liquid crystalline (LC) phase, respectively, of novel achiral non‐π‐delocalized nitroxide diradical compounds (R,S)‐1, which showed polymorphism in th...

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Published in:Chemistry : a European journal 2018-11, Vol.24 (65), p.17293-17302
Main Authors: Takemoto, Yusa, Zaytseva, Elena, Suzuki, Katsuaki, Yoshioka, Naoki, Takanishi, Yoichi, Funahashi, Masahiro, Uchida, Yoshiaki, Akita, Takuya, Park, Jayeong, Sato, Shuichi, Clevers, Simon, Coquerel, Gérard, Mazhukin, Dmitrii G., Shimono, Satoshi, Sugiyama, Masahito, Takahashi, Hiroki, Yamauchi, Jun, Tamura, Rui
Format: Article
Language:English
Subjects:
Chemical Sciences
Chemistry
Condensed Matter
Contamination
Crystal structure
Crystallinity
Diamagnetism
Impurities
Liquid crystals
Magnetic fields
Magnetic permeability
magnetic properties
Magnetic susceptibility
magneto-LC effect
Material chemistry
Metal ions
Metals
Nitroxide
nitroxide diradicals
phase transitions
Physics
Polymorphism
Solid phases
Superconducting quantum interference devices
Temperature dependence
Temperature effects
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Summary:A unique superparamagnetic‐like behavior and a large “positive magneto‐LC effect” were observed in the solid phases and the hexagonal columnar (Colh) liquid crystalline (LC) phase, respectively, of novel achiral non‐π‐delocalized nitroxide diradical compounds (R,S)‐1, which showed polymorphism in the solid phases (solids I and II). The SQUID magnetization measurement revealed that (1) (R,S)‐1 containing a small amount of racemic diastereomers (R*,R*)‐1 possessed an unusual and large temperature‐independent magnetic susceptibility (χTIM>0) component in the original nanocrystalline solid I that was responsible for the observed superparamagnetic‐like behavior under low magnetic fields and did not arise from the contamination by extrinsic magnetic metal or metal ion impurities, besides ordinary temperature‐dependent paramagnetic susceptibility (χpara>0) and temperature‐independent diamagnetic susceptibility (χdia
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201803534