title: LaSr3F5(CN2)2: a prototype structure for mixed-valent Eu4F5(CN2)2.
abstract: The new compound LaSr(3)F(5)(CN(2))(2) was prepared and structurally characterized as a prototype structure for the remarkably distorted mixed-valent compound Eu(4)F(5)(CN(2))(2), which contains four distinct europium ions in the structure: one Eu(3+) and three Eu(2+). Instead of repeating the given distorted structural pattern, LaSr(3)F(5)(CN(2))(2) forms a structure which can be considered as an ideal high-symmetry structure for Eu(4)F(5)(CN(2))(2), due to the occupation of La(3+) and Sr(2+) ions on one and the same crystallographic position. The crystal symmetry of this structure is an interesting issue to compare with what has been previously proposed.
authors.affiliation: Abteilung für Festkörperchemie und Theoretische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany.
authors.forename: Leonid
authors.initials: L
authors.lastname: Unverfehrt
authors.forename: Markus
authors.initials: M
authors.lastname: Ströbele
authors.forename: H-Jürgen
authors.initials: HJ
authors.lastname: Meyer