Magnetic properties of vanadium(IV)-based extended systems: [(VO)3(μ-PO4)2(2,2′-bpy)(μ-OH2)]*1/3H2O and (VO)2H4P2O9 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Inorganica Chimica Acta Année : 2013

Magnetic properties of vanadium(IV)-based extended systems: [(VO)3(μ-PO4)2(2,2′-bpy)(μ-OH2)]*1/3H2O and (VO)2H4P2O9

Diego Venegas-Yazigi
  • Fonction : Auteur
K. Muñoz
  • Fonction : Auteur
Marianela Saldias
  • Fonction : Auteur
K. Valdés de La Barra
  • Fonction : Auteur
A. Vega
  • Fonction : Auteur
V. Paredes-García
  • Fonction : Auteur
Carlos J. Gómez-García
  • Fonction : Auteur
W. Cañón-Mancisidor
  • Fonction : Auteur
E. Spodine
  • Fonction : Auteur

Résumé

The magnetic properties of [(VO)3(μ-PO4)2(2,2′-bpy)(μ-OH2)]1/3H2O (1) and (VO)2H4P2O9 (2), a tubular and a layered vanadium(IV) phosphates containing triply oxido bridged VIV dimers, are analyzed considering the Bleaney-Bowers S = 1/2 dimer model. In compound 1 the presence of an additional VIV connected with the VIV dimers through μ1,2-PO43− bridges is described with a Curie-Weiss type correction. This model reproduces the magnetic properties of compound 1 with g = 1.956, Jdim = −102.1 cm−1, θ = −0.4 cm−1 and Nα = 278 × 10−6 emu mol−1. In compound 2, the presence of a small percentage of paramagnetic impurity has to be considered to account for the divergence of χm at low temperatures. This simple model reproduces the magnetic data of compound 2 with g = 1.99, J = −62.4 cm−1 and a 1.2% of monomeric impurity. The moderate antiferromagnetic coupling found in the triply oxido bridges VIV dimers is justified from the structural parameters of the bridge. These studies confirm that the coupling through -O-P-O- bridges is antiferromagnetic and relatively weak, as well as previous magneto-structural correlations in this kind of oxido bridges. DFT calculations on a dinuclear fragment model for the two systems gave the following values of Jcalc = −72.4 cm−1 for 1 and Jcalc = −5.2 cm−1 for 2. These values reproduce the antiferromagnetic nature of the superexchange interactions between the VIV centers.

Domaines

Matériaux

Dates et versions

hal-00814129 , version 1 (16-04-2013)

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Citer

Diego Venegas-Yazigi, K. Muñoz, Marianela Saldias, K. Valdés de La Barra, A. Vega, et al.. Magnetic properties of vanadium(IV)-based extended systems: [(VO)3(μ-PO4)2(2,2′-bpy)(μ-OH2)]*1/3H2O and (VO)2H4P2O9. Inorganica Chimica Acta, 2013, 395, pp.176-180. ⟨10.1016/j.ica.2012.10.024⟩. ⟨hal-00814129⟩
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