title: Pentanuclear Ba(II) complex of a macrocyclic ligand.
abstract: We report here the first pentanuclear Ba(II) complex of a new tri-aza, tri-oxa macrocycle with two carboxymethyl "arms" pending from two N atoms, H2L2. The crystal structure corresponds to the formula [Ba5(H0.375L2)4(ClO4)(CH3CH2OH)(H2O)2](ClO4)2.5 x 9.5H2O and reveals the presence of four molecules of the ligand surrounding five Ba(II) ions, giving rise to an unusual structure with the metal ions inside a spherical organic cavity.
authors.affiliation: Departamento de Química Inorgánica, Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: Alberto
authors.initials: A
authors.lastname: Freiría
authors.forename: Rufina
authors.initials: R
authors.lastname: Bastida
authors.forename: M
authors.initials: M
authors.lastname: del Carmen Fernández-Fernández
authors.forename: Alejandro
authors.initials: A
authors.lastname: Macías
authors.forename: Laura
authors.initials: L
authors.lastname: Valencia
authors.forename: Manuel
authors.initials: M
authors.lastname: Vicente