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metal-organic compounds
Crystals of the title compound, 2,5-dimethylpiperazinediium β-octamolybdate, were grown under mild hydrothermal conditions. The anion and cations lie on inversion centers. A network of N—H
O bonds helps to stabilize the crystal packing.
O bonds helps to stabilize the crystal packing. metal-organic compoundsOpen 
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The title compound, poly[N,N,N′,N′-tetramethylpropane-1,3-diaminium [aquatetraoxotri-μ3-sulfatodiuranate(VI)]], (C7H20N2)[(UO2)2(SO4)3(H2O)]n, contains two-dimensional [(UO2)2(SO4)3(H2O)]2− layers that are unprecedented in uranium chemistry. The layers in this compound are separated by C7H20N22+ cations, forming the basis of an extensive hydrogen-bonding network. An independent intralayer hydrogen-bonding network is also observed, involving water molecules bound directly to a uranium centre.
metal-organic compoundsOpen access
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The title compound, bis(propane-1,2-diaminium) tetraaquadi-μ2-sulfato-disulfatotetraoxodiuranate(VI) dihydrate, (C3H12N2)2[U2O4(SO4)4(H2O)4]·2H2O, contains discrete centrosymmetric anionic {[UO2(H2O)2(SO4)2]2}4− dimers with C3H12N22+ cations balancing the charge. The dimers form hydrogen-bonded layers. The cations and occluded water molecules participate in an extensive hydrogen-bonding network. Each UVI centre is seven-coordinate with a pentagonal–bipyramidal geometry. Both pendent and bridging sulfate tetrahedra are observed, as well as bound and occluded water molecules.
metal-organic compounds
Crystals of the title compound, 2-(dimethylammonio)ethanaminium hexacosaoxaoctamolybdate(VI) dihydrate, containing extended chains constructed from centrosymmetric octamolybdate anions, were grown under mild hydrothermal conditions in the presence of N,N-dimethylethylenediamine. An extensive hydrogen-bonding network helps stabilize the crystal structure.
