Eur. Phys. J. B 73, 495-501 (2010)
https://doi.org/10.1140/epjb/e2010-00029-2

Magnetic behaviour of polyfluoroacridine-based organic molecular materials

¹ Universit di Milano Bicocca, Dipartimento di Scienza dei Materiali, via Cozzi 53, 20125 Milano, Italy
² Universit di Milano Bicocca, Dipartimento di Scienze Geologiche e Geotecnologie, Piazza della Scienza 4, 20126 Milano, Italy
³ Universit di Genova, Dipartimento di Chimica e Chimica industriale, Via Dodecaneso 31, 16146 Genova, Italy
⁴ CNR-IMEM c/o Universit di Genova, Dipartimento di Fisica, Via Dodecaneso 33, 16146 Genova, Italy
⁵ CNR-IENI, Corso Promessi Sposi 29, 23900 Lecco, Italy
⁶ Universit di Milano, Dipartimento di Chimica Strutturale e Stereochimica Inorganica and Facolt di Farmacia, Via Venezian 21, 20133 Milano, Italy

Corresponding author: adele.sassella@unimib.it

Received: 28 October 2009
Revised: 10 December 2009
Published online: 2 February 2010

Abstract

The solid state magnetic properties of two new molecular organic materials based on polyfluoro- acridines 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.