Magnetic and structural properties of two open-frameworks Nd(III) adipates

G. PUNTE; G. ECHEVERRÍA; F. SIVES; E. V. BRUSAU; J. C. PEDREGOSA; G. E. NARDA; J. A. ELLENA

Comptes Rendus Chimie

Año: 2005 vol. 8 p. 1469 - 1476

1631-0748

The structures of [Nd2(O2C(CH2)4CO2)3(H2O)4].6H2O and [Nd2(O2C(CH2)4CO2)3(H2O)2]. H2O synthesized from solutions at 293K and 353K, respectively, have been solved, at 120K and 293K. In both compounds infinite chains built of Nd(III) cations bridged by carboxylates and linked by adipate dianions have been found. Hydration and coordination waters are inside channels parallel to the chains. Both compounds exhibit a magnetic ordering transition, TC=280(2)K, a ferromagnetic coupled Curie-Weiss behavior above TC, and a c´-1 non-linear thermal dependence at low temperatures. The number of coordination and hydration waters strongly affects the channels size and geometry, and, in addition, seem to influence the overall magnetic behavior.