TY - JOUR
T1 - Charged Nitronyl Nitroxide Biradicals as Building Blocks for Molecular Ferrimagnetics
AU - Shiomi, Daisuke
AU - Ito, Kazuhiko
AU - Nishizawa, Masahiro
AU - Hase, Syuichiro
AU - Sato, Kazunobu
AU - Takui, Takeji
AU - Itoh, Koichi
N1 - Funding Information:
The authors (D. S. and K. S.) acknowledge the Ministry of Education, Science and Culture, Japan for Grants-in-Aid for Encouragement of Young Scientists (No. 09740528 and 10740275).
PY - 1999
Y1 - 1999
N2 - A crystal-engineering approach to organic ferrimagnetics is reported. Coulombic energy between cationic biradical with S=1 and anionic radical with S=1/2 is a promising driving force of co-crystallizing the hetero-molecular assemblage in a controllable manner. As a cationic component of "organic salt ferrimagnetics", two kinds of nitronyl nitroxide biradicals, 2,6- and 3,5-substituted pyridine derivatives, were examined. It was predicted from semi-empirical molecular orbital calculations that both the 2,6- and 3,5-derivatives have the triplet ground states both in the neutral and cationic states. The molecular ground state of the 2,6-biradical in the neutral state was found to be triplet from magnetic susceptibility measurements, while the susceptibility and ESR measurements suggested a singlet ground state for the 3,5-biradical.
AB - A crystal-engineering approach to organic ferrimagnetics is reported. Coulombic energy between cationic biradical with S=1 and anionic radical with S=1/2 is a promising driving force of co-crystallizing the hetero-molecular assemblage in a controllable manner. As a cationic component of "organic salt ferrimagnetics", two kinds of nitronyl nitroxide biradicals, 2,6- and 3,5-substituted pyridine derivatives, were examined. It was predicted from semi-empirical molecular orbital calculations that both the 2,6- and 3,5-derivatives have the triplet ground states both in the neutral and cationic states. The molecular ground state of the 2,6-biradical in the neutral state was found to be triplet from magnetic susceptibility measurements, while the susceptibility and ESR measurements suggested a singlet ground state for the 3,5-biradical.
KW - Crystal engineering
KW - Nitronyl nitroxide
KW - Organic ferrimagnet
KW - Organic salt
KW - Pyridinium cation
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U2 - 10.1080/10587259908023307
DO - 10.1080/10587259908023307
M3 - Article
AN - SCOPUS:0042225915
VL - 334
SP - 99
EP - 108
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
SN - 1542-1406
ER -