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Magnetic Interactions in Hydrogen‐Bonded Networks of Hydroxymethyl‐Substituted Phenyl Nitronyl Nitroxides
Author(s) -
Endtner Robin,
Rentschler Eva,
Bläser Dieter,
Boese Roland,
Sustmann Reiner
Publication year - 2000
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/1099-0690(200010)2000:19<3347::aid-ejoc3347>3.0.co;2-t
Subject(s) - chemistry , antiferromagnetism , nitroxide mediated radical polymerization , hydroxymethyl , hydrogen bond , ferromagnetism , magnetic susceptibility , paramagnetism , crystallography , squid , stereochemistry , condensed matter physics , molecule , polymerization , organic chemistry , ecology , physics , radical polymerization , biology , polymer
The 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 .