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inorganic compounds
The asymmetric unit of the compound (NH4)7(HPO4)2(PO4) consists of two hydrogen phosphate anions, one phosphate anion and seven ammonium cations, all of them located in general positions. The two [PO3(OH)]2− anions are linked to the PO43− anion via an O—H
O hydrogen bond to form a three-anion unit, which is surrounded by the ammonium cations. The anions and cations are further connected via N—HO hydrogen bonding.
O hydrogen bond to form a three-anion unit, which is surrounded by the ammonium cations. The anions and cations are further connected via N—HO hydrogen bonding.metal-organic compounds
The title compound, {[Er(C4H4O4)(H2O)3]Cl·2H2O}n, crystallizes with an infinite polymeric structure, in which erbium(III) ions on twofold rotation axes are bridged by centrosymmetric succinate dianions. The carboxylate groups of the dicarboxylate coordinate in a tridentate-bridging manner to the otherwise water-coordinated ErIII ion. The structure is completed by Cl− anions and uncoordinated water molecules.
inorganic compounds
Black single crystals of tetrasamarium(II) oxide hexaiodide, Sm4OI6, were obtained from a reaction of SmI3, SmOI, NaI, and Na in a sealed tantalum container. Sm4OI6 crystallizes in space group P63mc and, like many M4OX6 type oxide halides of divalent metals, adopts the anti-K6HgS4/Na6ZnO4 type of structure, with K6HgS4 ≃ I6OSm4. A tetrahedron of samarium(II) that incorporates an oxide ion is surrounded by 18 iodide ions which are connected further into a three-dimensional non-centrosymmetric structure. The O atom and one of the Sm atoms occupy sites with 3m symmetry, whereas the second Sm atom and both I atoms are located at sites with m symmetry.
metal-organic compounds
Yellow crystals of the title compound, poly[[aqualithium(I)]-μ3-iodofumarato], [Li(HOOC—CH=CI—COO)(H2O)]n, crystallized unexpectedly from an aqueous solution containing acetylenedicarboxylic acid and LiI. The lithium cation is coordinated tetrahedrally by four O atoms of three iodofumarate anions and one water molecule. These tetrahedra are connected such that a layered coordination polymer is formed.
