Magnetic behaviour of polyfluoroacridine-based organic molecular materials

• Published in: The European physical journal. B, Condensed matter physics Vol. 73; no. 4; pp. 495 - 501
• Main Authors: Campiglio, P., Campione, M., Canepa, F., Canevali, C., Cimberle, M. R., Fanciulli, C., Miozzo, L., Moret, M., Papagni, A., Rizzato, S., Sassella, A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.02.2010; EDP Sciences; Springer
• Subjects: Complex Systems; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Diamagnetism, paramagnetism and superparamagnetism; Exact sciences and technology; Exchange and superexchange interactions; Fluid- and Aerodynamics; Magnetic properties; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetization; Nonmetals; Optical properties; Physics; Physics and Astronomy; Semiconductors; Solid State and Materials; Solid State Physics; Acridine; Magnetic Behaviour; Electron Paramagnetic Resonance Signal; TEMPOL; Electron Paramagnetic Resonance Spectrum; Chemical modification; Magnetization; Crystalline polymer; Paramagnetism; Molecular crystals; XRD; Electron paramagnetic resonance; Monoclinic lattices; Acridine derivative polymer; Exchange interactions; Magnetic properties
• ISSN: 1434-6028; 1434-6036
• DOI: 10.1140/epjb/e2010-00029-2

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.