Hydrothermal investigation of the lanthanide (Ln=La, Ce, Pr, Nd, Sm) 2,6-pyridinedicarboxylate system |
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| Authors: | C Brouca-Cabarrecq A FernandesJ Jaud JP Costes |
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| Institution: | a Centre d'Elaboration de Matériaux et d'Etudes Structurales du CNRS, 29 rue Jeanne Marvig, BP 43 47, 31055 Toulouse Cedex 4, France
b Laboratoire de Chimie de Coordination du CNRS, 205 route de Narbonne, 31077 Toulouse Cedex, France |
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| Abstract: | In this paper, two new dipicolinate complexes, Ln2(dipic)3(H2O)3 (1) with Ln=La, Ce, Pr, Nd, Sm and Ce3(dipic)5(H2O)2 (2), are described. Hydrothermal synthesis, crystal structure and thermal behaviour of both compounds are described, as well as the magnetic behaviour of the trinuclear complex (2). The structures consist of LaO7N2, LaO7N (1) and CeO7N, CeO6N3 (2) polyhedra linked to form three-dimensional networks. The magnetic study of 2 confirms that it corresponds to a Ce(III)-Ce(IV) molecular compound and that the magnetic interaction is certainly antiferromagnetic. According to the thermogravimetric analysis, thermal decomposition of compounds 1 starts at about 100-130 °C, when 2 is thermally stable up to 250 °C. |
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| Keywords: | Lanthanide complexes Dipicolinic acid Crystal structures Magnetic properties |
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