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In the title salt, [(CH3)2NH2][Cu(HSO4)(SO4)(H2O)4], one type of cation and anion is present in the asymmetric unit. The CuII atom in the complex anion, [Cu(HSO4)(SO4)(H2O)4], has a tetra­gonal bipyramidal [4 + 2] coordination caused by a Jahn–Teller distortion, with the aqua ligands in equatorial and two O atoms of tetra­hedral HSO4 and SO4 units in apical positions. Both types of ions form sheets parallel to (010). The inter­connection within and between the sheets is reinforced by O—H...O and N—H...O hydrogen bonds, respectively, involving the water mol­ecules, the two types of sulfate anions and the ammonium groups.

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In the title molecular salt, [NH2(CH2CH3)2][H2PO4], two unique types of cations and anions, which are configurationally very similar, are present in the asymmetric unit. Both ions form sheets approximately parallel to (-1-1) linked by weak hydrogen bonds. The inter­connection within and between the sheets is reinforced by O—H...O and N—H...O hydrogen bonds involving the tetra­hedral H2PO4 anions and the ammonium groups.

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The PrIII cation is surrounded ninefold by five sulfate groups (two monodentate and three chelating) and by one water mol­ecule. The [Pr(SO4)5(H2O)] groups are arranged in sheets parallel to (010); two crystal water mol­ecules and two ethyl­enedi­ammonium cations connect the sheets via O—H...O and N—H...O hydrogen bonds into a three-dimensional framework structure.

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In the salt bis­(di­methyl­ammonium) hexa­aqua­nickelate(II) bis­(sulfate) dihydrate, the NiII cation is located on a centre of inversion and exhibits a slightly distorted octa­hedral arrangement of water mol­ecules. The noncoordinating water mol­ecules and di­methyl­ammonium cations connect the sulfate and [Ni(H2O)6]2+ octa­hedra via O—H...O and N—H...O hydrogen bonds into a three-dimensional framework.
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