Ferromagnetic and Antiferromagnetic Intermolecular Arrangements of theN-Alkylpyridinium Nitronyl Nitroxide
作者:
Kunio Awaga,
Akira Yamaguchi,
Tsunehisa Okuno,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 271,
issue 1
页码: 97-105
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508034042
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The magneto-structural correlation in somep-N-alkylpyridinium nitronyl nitroxide salts has been studied. In the iodide salts ofp-N-R-pyridinium nitronyl nitroxides with R=methyl, ethyl,n-propyl, andn-butyl, the magnetic property varies from antiferromagnetic to ferromagnetic with the extension of theN-alkyl chain. The nearest-neighbor molecular arrangements of the nitroxides observed in the four crystals, can be classified into two groups: the radicals are connected by a intermolecular contact between the NO groups (Type I) or between the NO group and the pyridinium ring (Type II). The observed magnetic behaviors can be interpreted in terms of an antiferromagnetic intermolecular interaction for the Type I contact and a ferromagnetic for Type II. Effects of replacement of the I−ion by Br−or Cl−, have been also studied in thep-N-methyl derivative.
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