title: Alkaline earth guests in polyoxopalladate chemistry: from nanocube to nanostar via an open-shell structure.
abstract: The three novel, discrete palladium(II)-oxo clusters [CaPd12O8(PhAsO3)8](6-) (CaPd12), [SrPd12O6(OH)3(PhAsO3)6(OAc)3](4-) (SrPd12), and [BaPd15O10(PhAsO3)10](8-) (BaPd15) encapsulating alkaline earth metal ions were prepared and fully characterized by a multitude of solution and solid-state physicochemical techniques. We have discovered a structure-directing template effect induced by the respective size of the alkaline earth guest ion, which determines the detailed condensation arrangement of the peripheral Pd(II)-oxo shell. The unprecedented SrPd12 with an open-shell type structure is of particular importance and reflects a successful strategy for deliberate design of new structural classes of polyoxo-noble-metalates. Furthermore, the unusual acetate-water ligand exchange phenomenon renders SrPd12 as a promising candidate for noble-metal-based catalysis.
authors.affiliation: Jacobs University, School of Engineering and Science, P.O. Box 750561, 28725 Bremen (Germany) http://www.jacobs-university.de/ses/ukortz.
authors.forename: Peng
authors.initials: P
authors.lastname: Yang
authors.forename: Yixian
authors.initials: Y
authors.lastname: Xiang
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Lin
authors.forename: Bassem S
authors.initials: BS
authors.lastname: Bassil
authors.forename: Jie
authors.initials: J
authors.lastname: Cao
authors.forename: Linyuan
authors.initials: L
authors.lastname: Fan
authors.forename: Yanxuan
authors.initials: Y
authors.lastname: Fan
authors.forename: Ming-Xing
authors.initials: MX
authors.lastname: Li
authors.forename: Pablo
authors.initials: P
authors.lastname: Jiménez-Lozano
authors.forename: Jorge J
authors.initials: JJ
authors.lastname: Carbó
authors.forename: Josep M
authors.initials: JM
authors.lastname: Poblet
authors.forename: Ulrich
authors.initials: U
authors.lastname: Kortz
keywords: X-ray diffraction; cluster compounds; palladium; polyoxometalates; template effect