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Updated: Feb 2, 2026

Synthesis and Characterization of Amphiphilic Gold Nanoparticles
Published on: July 2, 2019
Antiferromagnetic ordering based on intermolecular London dispersion interactions in amphiphilic TEMPO ammonium salts
Jessica Exner1, Steffen Eusterwiemann, Oliver Janka
1Organic Chemistry Institute, Westfälische Wilhelms-University Münster, Corrensstrasse 40, 48149 Münster, Germany. studer@uni-muenster.de j.neugebauer@uni-muenster.de.
Abstract:
Antiferromagnetic coupling in TEMPO-based radicals can be enhanced via self-assembly through London dispersion interactions in amphiphilic solids. The synthesis, magnetic characterization, and three crystal structures of the solid radical ion salts (R-DMAT-n)X with various counterions X and alkyl chain lengths n are reported. Magnetic susceptibility and absolute EPR signal intensity measurements show singlet-triplet transitions in a number of cases, which is discussed in relation to the crystal structures. Antiferromagnetic ordering effects are sensitive to both the length of the alkyl chain and the counter anion.
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