Unique Superparamagnetic-like Behavior Observed in Non-π-delocalized Nitroxide Diradical Compounds Showing Discotic Liquid Crystalline Phase
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Chemistry - A European Journal
ISSN: 0947-6539
, E-ISSN: 1521-3765
|
| Вых. Данные |
Год: 2018,
Том: 24,
Номер: 65,
Страницы: 17293-17302
Страниц
: 10
DOI:
10.1002/chem.201803534
|
| Ключевые слова |
liquid crystals, magnetic properties, magneto-LC effect, nitroxide diradicals, phase transitions |
| Авторы |
Takemoto Yusa
1
,
Zaytseva Elena
1,2,3
,
Suzuki Katsuaki
1
,
Yoshioka Naoki
4
,
Takanishi Yoichi
5
,
Funahashi Masahiro
6
,
Uchida Yoshiaki
7
,
Akita Takuya
7
,
Park Jayeong
1
,
Sato Shuichi
1
,
Clevers Simon
8,9
,
Coquerel Gérard
8,9
,
Mazhukin Dmitrii G.
2,3
,
Shimono Satoshi
1
,
Sugiyama Masahito
1
,
Takahashi Hiroki
1
,
Yamauchi Jun
1
,
Tamura Rui
1
|
| Организации |
| 1 |
Graduate School of Human and Environmental Studies
Kyoto University, Yoshida Nihonmatsu-cho
Sakyo-ku, Kyoto 606-8501 (Japan)
|
| 2 |
N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry
Siberian Branch of Russian Academy of Sciences
|
| 3 |
Новосибирский национальный исследовательский государственный университет
|
| 4 |
Department of Applied Chemistry, Keio University
Yokohama Kanagawa 223-8522 (Japan)
|
| 5 |
Graduate School of Science
Kyoto University
Kyoto 606-8502 (Japan)
|
| 6 |
Department of Advanced Materials Science, Faculty of Engineering
Kagawa University
Takamatsu, Kagawa 761-0396 (Japan)
|
| 7 |
Graduate School of Engineering Science, Osaka University
Toyonaka, Osaka 560-8531 (Japan)
|
| 8 |
Dr. S. Clevers, Prof. G. Coquerel
Normandie Universit8, SMS, EA 3233
Univ Rouen, Crystal Genesis Unit
76821 Mont Saint-Aignan Cedex (France)
|
| 9 |
Dr. S. Clevers, Prof. G. Coquerel
Normandie Universit8, SMS, EA 3233
Univ Rouen, Crystal Genesis Unit
76821 Mont Saint-Aignan Cedex (France)
|
|
Информация о финансировании (1)
|
1
|
Japan Society for the Promotion of Science
|
26248024
|
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-p-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 (cTIM >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 (cpara>0) and temperature-independent diamagnetic susceptibility (cdia<0) components, (2) a large increase in molar magnetic susceptibility (cM) (positive magneto-LC effect) that occurred at the solid I-to-liquid crystal transition upon heating was preserved as an additional cTIM increase in the resulting polymorphic nanocrystalline solid II by cooling, and (3) such unique magnetic phenomena were induced by thermal processing for (R,S)-1 or by adding a small amount of (R*,R*)-1 to (R,S)-1 as the impurity.