title: Cs(2)UPd(3)Se(6).
abstract: Dicaesium uranium(IV) tripalladium(II) hexa-selenide, Cs(2)UPd(3)Se(6), crystallizes in the space group Fmmm in the Ba(2)NaCu(3)O(6) structure type. The asymmetric unit comprises the following atoms with site symmetries as shown: U1 (mm2), Cs1 (222), Cs2 (m2m), Pd1 (.m.), Pd2 (2mm), Se1 (m..), and Se2 (1). This layered structure contains six edge-sharing square-planar [PdSe(4)] units that form a hexa-gon. These, in turn, edge-share with [USe(6)] trigonal-prismatic units, forming an extended layer parallel to (010). The layers are stacked along [010]. They are staggered, and are separated by the Cs atoms. The Cs atoms are either coordinated in a square anti-prism of Se atoms or are ten-coordinate, with one square face and the opposite face hexa-gonal.
authors.affiliation: Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208-3113, USA.
authors.forename: George N
authors.initials: GN
authors.lastname: Oh
authors.forename: James A
authors.initials: JA
authors.lastname: Ibers