Crystal Structures of 4-(4-Halobenzylideneamino)-TEMPO Radicals Showing Magnetic Interactions

X-ray crystal structure analyses were performed on 4-(4-halo-benzylidene-amino)-TEMPO radicals, as well as other 4-Ar-CH=N-TEMPO radicals (Ar = 4-Ph-Ph, 4-Py, Ph, 4-MeS-Ph, 3-Py and 4-Me-Ph), at room temperature. Some of these crystals have been revealed to show intermolecular ferromagnetic interact...

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Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1998-05, Vol.313 (1), p.223-228
Main Authors: Iwasaki, Fujiko, Yamamoto, Hazime, Yoshikawa, Joseph H., Takada, Kiwamu, Kannari, Eiji, Yasui, Masanori, Ishida, Takayuki, Nogami, Takashi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
crystal structures
Exact sciences and technology
Exchange and superexchange interactions
Heterocyclic compounds
magnetic interactions
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Organic compounds
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
TEMPO radicals
X-ray structure analysis
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Summary:X-ray crystal structure analyses were performed on 4-(4-halo-benzylidene-amino)-TEMPO radicals, as well as other 4-Ar-CH=N-TEMPO radicals (Ar = 4-Ph-Ph, 4-Py, Ph, 4-MeS-Ph, 3-Py and 4-Me-Ph), at room temperature. Some of these crystals have been revealed to show intermolecular ferromagnetic interactions at an extremely low temperature. X-ray studies revealed that the crystals of the 4-I-Ph derivative showed two modifications; one showed a ferromagnetic transition and the other showed an antiferromagnetic interaction. Structural features of these TEMPO crystals are mainly classified to four groups: 1) structures of Cl-Ph, I-Ph and Ph-Ph derivatives which show a ferromagnetic transition, 2) Br-Ph and 4-Py derivatives with a ferromagnetic interaction, 3) Ph, 4-MeS-Ph, 3-Py, 4-Me-Ph derivatives showing different kinds of magnetic interactions, and 4) others including antiferromagnetic F-Ph and I-Ph derivatives.
ISSN:1058-725X
DOI:10.1080/10587259808044279