title: A new class of hybrid materials via salt inclusion: novel copper(II) arsenates Na(5)ACu(4)(AsO(4))(4)Cl(2) (A = Rb, Cs) composed of alternating covalent and ionic lattices.
abstract: Two novel copper(II) arsenates Na5ACu4(AsO4)4Cl2 (A = Rb, Cs) were synthesized by conventional solid-state methods using reactive molten salt media. These compounds are isostructural and crystallize in an orthorhombic lattice (Fmmm, No. 69; Z = 8). The cell constants are a = 14.632(3) A, b = 18.872(2) A, c = 14.445(3) A, V = 3989(1) A3, for A = Rb; a = 14.638(3) A, b = 18.990(4) A, c = 14.418(3) A, V = 4008(1) A3, for A = Cs. Single-crystal structure studies reveal a new composite framework consisting of alternating covalent and ionic lattices. The covalent lattice contains highly oriented oligomeric mu-oxo [Cu4O12]16- tetrameric units with a cyclo-S8-like Cu4O4 magnetic core that resembles the building block of layered cuprates. The ionic slab consists of a novel framework of mixed alkali metal chloride lattice and rarely seen Na6O8 clusters. Similar to organic-inorganic hybrid materials, the title compounds present a new class of host-guest chemistry via salt inclusion reactions.
authors.affiliation: Department of Chemistry, Clemson University, Clemson, South Carolina 29634-0973, USA. shwu@clemson.edu
authors.forename: Shiou-Jyh
authors.initials: SJ
authors.lastname: Hwu
authors.forename: Mutlu
authors.initials: M
authors.lastname: Ulutagay-Kartin
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Clayhold
authors.forename: Richard
authors.initials: R
authors.lastname: Mackay
authors.forename: Tina A
authors.initials: TA
authors.lastname: Wardojo
authors.forename: Charles J
authors.initials: CJ
authors.lastname: O'Connor
authors.forename: Mariusz
authors.initials: M
authors.lastname: Krawiec