Magnetic Studies of Redox-​Active Tetrathiafulvalene-​Based Complexes: Dysprosium vs. Ytterbium AnaloguesRedox-​Active Tetrathiafulvalene-​Based Complexes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue European Journal of Inorganic Chemistry Année : 2014

Magnetic Studies of Redox-​Active Tetrathiafulvalene-​Based Complexes: Dysprosium vs. Ytterbium AnaloguesRedox-​Active Tetrathiafulvalene-​Based Complexes

Résumé

The two mononuclear complexes [Ln(tta)​3(L)​]​*C6H14 {Ln = DyIII and YbIII} (tta-​ = 2-​thenoyltrifluoroacetonate, L = 2-​{1-​methylpyridyl-​4,​5-​[4,​5-​bis(propylthio)​tetrathiafulvalenyl]​-​1H-​benzimidazol-​2-​yl}​pyridine) are isostructural. The lanthanide ions adopt a distorted-​square-​antiprism coordination polyhedron (D4d symmetry)​. The DyIII compd. behaves like a single-​mol. magnet (SMM)​, whereas no out-​of-​phase component of the magnetic susceptibility is measured for YbIII. The crystal-​field splitting of the 2F7​/2 and 6H15​/2 ground multiplets of YbIII and DyIII, resp., were detd. by means of ab initio calcns. and confirmed by the emission energy lines of the 2F5​/2→2F7​/2 luminescence spectrum in the case of YbIII. The nature of the MJ ground states indicates that YbIII is not an Ising system, whereas DyIII is. The exptl. and calcd. anisotropy axes for DyIII lie along the most neg. charged direction, whereas those for YbIII lie almost perpendicularly. Finally, the gz values corroborate the uniaxiality of the anisotropy axis for DyIII.

Dates et versions

hal-00973725 , version 1 (04-04-2014)

Identifiants

Citer

Julie Jung, Tamyris T. da Cunha, Boris Le Guennic, Fabrice Pointillart, Cynthia L. M. Pereira, et al.. Magnetic Studies of Redox-​Active Tetrathiafulvalene-​Based Complexes: Dysprosium vs. Ytterbium AnaloguesRedox-​Active Tetrathiafulvalene-​Based Complexes. European Journal of Inorganic Chemistry, 2014, 2014 (24), pp.3888-3894. ⟨10.1002/ejic.201400121⟩. ⟨hal-00973725⟩
84 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More