Magnetic Interactions in Hydrogen-Bonded Networks of Hydroxymethyl-Substituted Phenyl Nitronyl Nitroxides
2000; Wiley; Volume: 2000; Issue: 19 Linguagem: Inglês
10.1002/1099-0690(200010)2000
ISSN1434-193X
AutoresR. Endtner, Eva Rentschler, Dieter Bläser, Roland Boese, Reiner Sustmann,
Tópico(s)Organic and Molecular Conductors Research
ResumoThe ortho-, meta-, and para-Hydroxymethyl-substituted 4,4,5,5-tetramethyl-3-oxyl-2-phenylimidazoline 1-oxides (1−3) were synthesized and characterized by X-ray crystallography. The magnetic susceptibility was determined by temperature-dependent SQUID measurements. The nitronyl nitroxides 1 and 3 display a paramagnetic susceptibility which follows the Curie−Weiss law. Weak ferromagnetic interactions can be recognized at very low temperature. The nitronyl nitroxide 2 shows temperature-dependent antiferromagnetic behavior, which can be fitted perfectly with the Heisenberg linear-chain theory with an intrachain exchange interaction of −18.43 cm−1.
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