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Magnetic and optical properties of nitroxide radicals and their lanthanide complexes |
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| Authors: | Christophe Lescop Guillaume Bussière Hugo Bélisle Paul Rey∗ Dominique Luneau |
| Institution: | a Laboratoire de Chimie Inorganique et Biologique (UMR 5046), RFMC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09, France b Département de chimie, Université de Montréal, Montréal QC, Canada H3C 3J7 c Laboratoire de Spectrométrie Physique (UMR 5588), Université Joseph Fourier, BP 87, Saint Martin d'Hères 38402, France d Laboratoire des Multimatériaux et Interfaces (UMR 5615), Cristallographie et Ingénierie Moléculaire (Bât. J. Raulin), Université Claude Bernard Lyon 1, 43 avenue du, 11 novembre 1918, Villeurbanne cedex 69622, France |
| Abstract: | This paper reports the structural, magnetic and optical properties of three series of lanthanide complexes Ln(radical)4](ClO4)3, Ln(radical)2(NO3)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 GdIII-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. |
| Keywords: | Magnetic properties Luminescence |
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