The solid state magnetic properties of two new molecular organic materials based on polyfluoroacridines functionalised with the 2,2,6,6-tetramethyl piperidine-1-oxyl radical (TEMPO) have been analyzed. After a first characterisation of the two materials by electron paramagnetic resonance and by X-ray diffraction, magnetisation measurements were performed from room temperature down to 2 K and the paramagnetic behaviour due to the unpaired spin on the radical TEMPO observed. Both compounds show some ferro-magnetic interactions down to 40 K, while at lower temperatures an antiferro-magnetic contribution switches on, possibly related to the reduction of intermolecular distances.
Magnetic behaviour of polyfluoroacridine-based organic molecular materials / P. Campiglio, M. Campione, F. Canepa, C. Canevali, M.R. Cimberle, C. Fanciulli, L. Miozzo, M. Moret, A. Papagni, S. Rizzato, A. Sassella. - In: THE EUROPEAN PHYSICAL JOURNAL. B, CONDENSED MATTER PHYSICS. - ISSN 1434-6028. - 73:4(2010 Feb), pp. 495-501. [10.1140/epjb/e2010-00029-2]
Magnetic behaviour of polyfluoroacridine-based organic molecular materials
S. RizzatoPenultimo
;
2010
Abstract
The solid state magnetic properties of two new molecular organic materials based on polyfluoroacridines functionalised with the 2,2,6,6-tetramethyl piperidine-1-oxyl radical (TEMPO) have been analyzed. After a first characterisation of the two materials by electron paramagnetic resonance and by X-ray diffraction, magnetisation measurements were performed from room temperature down to 2 K and the paramagnetic behaviour due to the unpaired spin on the radical TEMPO observed. Both compounds show some ferro-magnetic interactions down to 40 K, while at lower temperatures an antiferro-magnetic contribution switches on, possibly related to the reduction of intermolecular distances.
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