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

PUNTE, GRACIELA; ECHEVERRÍA, GUSTAVO; SIVES, FLAVIO R.; BRUSAU, ELENA V.; PEDREGOSA, JOSE; NARDA, GRISELDA; ELLENA, JAVIER

COMPTES RENDUS CHIMIE

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

Lugar: Paris; Año: 2005 vol. 8 p. 1469 - 1476

1631-0748

The structures of [Nd2(O2C(CH2)4CO2)3(H2O)4]·6 H2O and [Nd2(O2C(CH2)4CO2)3(H2O)2]·H2O synthesized from solutions at 293 and 353 K, respectively, have been solved, at 120 and 293 K. 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 v′?1 non-linear thermal dependence at low temperatures. The number of coordination and hydration waters strongly affects channels size and geometry, and, in addition, seems to influence the overall magnetic behavior.