KAHN, Olivier; OUSHOORN, Robert; GUILLOU, Olivier; DRILLON, Marc; RABU, Pierre; BOUBEKEUR, Kamal; BATAIL, Patrick

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KAHN, Olivier
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de Chimie Inorganique

OUSHOORN, Robert
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de Chimie Inorganique

GUILLOU, Olivier
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Laboratoire de Chimie Inorganique

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Ce document a été publié dans

New Journal of Chemistry. 1995, vol. 19, n° 5-6, p. 655-660

Royal Society of Chemistry

Résumé en anglais

The crystal structure of Nd 2 [Cu{pba)b•23 H 2 O with pba= 1,3-propylenebis(oxamato) was first described two years aga. lt consists of tube-like motifs of the formula Nd 2 [Cu(pba)b{H 2 O) 9 and noncoordinated water molecules. Each Nd(III) ion is surrounded by three nearest-neighbor Cu(II) ions, and in turn each Cu(II) ion_is situated between two Nd(III) ions. The magnetic properties of the compound have been investigated. The magnetic susceptibility presents a rounded maximum around 2.5 K, and the product of the magnetic susceptibility and the temperature tends to zero as the temperature approaches absolute zero. This indicates that the ground state of the compound is quasinonmagnetic, which at a first view is quite an unexpected result. This situation is attributed to a compensation between the local magnetic moments of the two Nd(III) ions and the three Cu(III) ions at low temperature. This idea has been tested with a theoretical model in which the local Kramer's doublets for Nd(III) and Cu(II) interact antiferromagnetically. A compensation of the magnetic moments may be expected for a value of the ratio g d /9c u close to 1.73 g d and 9cu being the average values of the Zeeman factor for the ground Kramer's doublet of Nd(III) and Cu(II), respectively.< Réduire

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Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026