Antiferromagnetic ordering based on intermolecular London dispersion interactions in amphiphilic TEMPO ammonium salts

Jessica Exner; Steffen Eusterwiemann; Oliver Janka; Carsten Doerenkamp; Anja Massolle; Oliver Niehaus; Constantin G. Daniliuc; Rainer Pöttgen; Johannes Neugebauer; Armido Studer; Hellmut Eckert

doi:10.1039/C8CP05837G

Antiferromagnetic ordering based on intermolecular London dispersion interactions in amphiphilic TEMPO ammonium salts†

Jessica Exner,^a Steffen Eusterwiemann,^a Oliver Janka,

^b Carsten Doerenkamp,^cd Anja Massolle,^ae Oliver Niehaus,^b Constantin G. Daniliuc,

^a Rainer Pöttgen,

*^b Johannes Neugebauer,

*^ae Armido Studer

*^a and Hellmut Eckert

*^cd

Author affiliations

* Corresponding authors

^a Organic Chemistry Institute, Westfälische Wilhelms-University Münster, Corrensstrasse 40, 48149 Münster, Germany
E-mail: studer@uni-muenster.de, j.neugebauer@uni-muenster.de

^b Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
E-mail: pottgen@uni-muenster.de

^c Institute of Physical Chemistry, Westfälische Wilhelms-University Münster, Corrensstrasse 28/30, 48149 Münster, Germany
E-mail: eckerth@uni-muenster.de

^d São Carlos Institute of Physics, University of São Paulo, Av. Trab. São-Carlense 400, 13566-590 São Carlos, SP, Brazil
E-mail: eckerth@uni-muenster.de

^e Center for Multiscale Theory and Computation, Corrensstrasse 40, 48149 Münster, Germany

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.

Physical Chemistry Chemical Physics

Antiferromagnetic ordering based on intermolecular London dispersion interactions in amphiphilic TEMPO ammonium salts†

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Antiferromagnetic ordering based on intermolecular London dispersion interactions in amphiphilic TEMPO ammonium salts

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