title: Magnetic properties of cyano-bridged Ln3+-M3+ complexes. Part I: trinuclear complexes (Ln3+ = La, Ce, Pr, Nd, Sm; M3+ = FeLS, Co) with bpy as blocking ligand.
abstract: The reaction of Ln(NO3)3(aq) with K3[Fe(CN)6] or K3[Co(CN)6] and 2,2'-bipyridine in water/ethanol led to eight trinuclear complexes: trans-[M(CN)4(mu-CN)2{Ln(H2O)4(bpy)2}2][M(CN)6].8H2O (M = Fe3+ or Co3+, Ln = La3+, Ce3+, Pr3+, Nd3+, and Sm3+). The structures for the eight complexes [La2Fe] (1), [Ce2Fe] (2), [Pr2Fe] (3), [Nd2Fe] (4), [Ce2Co] (5), [Pr2Co] (6), [Nd2Co] (7), and [Sm2Co] (8) have been solved; they crystallize in the triclinic space group P and are isomorphous. They exhibit a supramolecular 3D architecture through hydrogen bonding and pi-pi stacking interactions. A stereochemical study of the nine-vertex polyhedra of the lanthanide ions, based on continuous shape measures, is presented. No significant magnetic interaction was found between the lanthanide(III) and the iron(III) ions.
authors.affiliation: Departament de Química Inorgànica, Universitat de Barcelona, Martí i Franquès, Spain.
authors.forename: Albert
authors.initials: A
authors.lastname: Figuerola
authors.forename: Joan
authors.initials: J
authors.lastname: Ribas
authors.forename: Miquel
authors.initials: M
authors.lastname: Llunell
authors.forename: David
authors.initials: D
authors.lastname: Casanova
authors.forename: Miguel
authors.initials: M
authors.lastname: Maestro
authors.forename: Santiago
authors.initials: S
authors.lastname: Alvarez
authors.forename: Carmen
authors.initials: C
authors.lastname: Diaz