title: Hybrid Lanthanide-Actinide Peroxide Cage Clusters.
abstract: A cage cluster consisting of 31 uranyl and 9 Sm(3+) polyhedra self-assembles in an alkaline aqueous peroxide solution and crystallizes (U31Sm9). Trimers of Sm(3+) polyhedra are templated by μ3-η(2):η(2):η(2)-peroxide groups and link to oxo atoms of uranyl ions. Three such trimers link into a ring through uranyl hexagonal bipyramids, and these are attached through six polyhedra to a unit consisting of 21 uranyl hexagonal bipyramids to complete the cage. Luminescence spectra collected with an excitation wavelength of 420 nm reveal fine structure, which is not observed for a cluster containing only uranyl polyhedra.
authors.forename: Ginger E
authors.initials: GE
authors.lastname: Sigmon
authors.forename: Jennifer E S
authors.initials: JE
authors.lastname: Szymanowski
authors.affiliation: Department of Chemistry, The George Washington University , 800 22nd Street NW, Washington, D.C. 20052, United States.
authors.forename: Korey P
authors.initials: KP
authors.lastname: Carter
authors.affiliation: Department of Chemistry, The George Washington University , 800 22nd Street NW, Washington, D.C. 20052, United States.
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Cahill
authors.forename: Peter C
authors.initials: PC
authors.lastname: Burns