Magnetic and optical properties of nitroxide radicals and their lanthanide complexes

• Published in: The Journal of physics and chemistry of solids 2004-04, Vol.65 (4), p.773-779
• Main Authors: Lescop, Christophe, Bussière, Guillaume, Beaulac, Rémi, Bélisle, Hugo, Belorizky, Elie, Rey, Paul, Reber, Christian, Luneau, Dominique
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Exchange and superexchange interactions; Luminescence; Magnetic properties; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Photoluminescence; Physics
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2003.11.014

This paper reports the structural, magnetic and optical properties of three series of lanthanide complexes [Ln(radical) 4](ClO 4) 3, [Ln(radical) 2(NO 3) 3] and [Ln(radical)(hfac) 3] (Ln=Gd(III), La(III) or Eu(III)) with nitronyl or imino nitroxide radicals. The magnetic properties of the gadolinium complexes were studied. Along the series, most gadolinium(III) complexes exhibit antiferromagnetic Gd III-radical interaction. These results are discussed. The full absorption and luminescence spectra of some lanthanide complexes and their uncoordinated free radical ligands were measured. The rich vibronic structure in luminescence and absorption spectra indicates that several excited states define the absorption spectra between 400 and 800 nm. Qualitative trends can be established between magnetic ground state properties and the energies and vibronic structure of the title compounds.