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Magnetic Properties and Crystal Structure of Solvent‐Free Sc@C 82 Metallofullerene Microcrystals
Author(s) -
Ito Yasuhiro,
Fujita Wataru,
Okazaki Toshiya,
Sugai Toshiki,
Awaga Kunio,
Nishibori Eiji,
Takata Masaki,
Sakata Makoto,
Shinohara Hisanori
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700097
Subject(s) - metallofullerene , crystal structure , solvent , chemistry , crystallography , fullerene , materials science , chemical physics , organic chemistry
Magnetic properties of solvent‐free crystals of the endohedral Sc@C 82 are investigated by SQUID and X‐ray powder diffraction. We find that the crystal is a paramagnet and the magnetic susceptibility decreases from 150 K with evidence of antiferromagnetic‐like interactions by slow cooling. X‐ray crystal analysis reveals the presence of a phase transition at 150 K, which is attributed to an orientational ordering transition of the fullerene molecules. At low temperatures we find a magnetic metastable state that can be controlled by the cooling rate. The metastable state can be formed by rapid cooling. The direction of Sc@C 82 molecular axis in the crystals is disordered in the metastable state, and the susceptibility is higher than that in the slow cooling case at low temperature.