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In the title compound, 2C8H12NO+·H2P2O72−, the linked PO4 groups of the diphosphate anion are almost eclipsed and the P—O—P angle is 134.45 (7)°. In the crystal, infinite ribbons of H2P2O72− anions propagate in [100], being linked by strong O—H...O hydrogen bonds. The 4-meth­oxy­benzyl­ammonium cations bond to the diphosphate chains by N—H...O and C—H...O links, and are themselves linked by C—H...π inter­actions.

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In the title complex, (C8H14N2)[Co(H2P2O7)2(H2O)2]·2H2O, the CoII ion lies on an inversion center and is coordinated by two bidentate diphosphate ligands and two water mol­ecules in a slightly distorted octa­hedral coordination geometry. The m-xylylenediaminium cation is located on a twofold rotation axis. In the crystal, a three-dimensional supra­molecular assembly is constructed by O—H...O and N—H...O hydrogen bonds between the organic cations, complex anions and uncoordin­ated water mol­ecules.

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The asymmetric unit of the title compound, (C8H12NO)2[Mn(H2P2O7)2(H2O)2]·2H2O, consists of half an MnII complex anion, a 2-meth­oxy­benyl­ammonium cation and a solvent water mol­ecule. The MnII complex anion lies across an inversion center, and has a slightly distorted octa­hedral coordination environment for the MnII ion, formed by two bidentate dihydrogendiphosphate ligands and two water mol­ecules. In the crystal, the components are linked by O—H...O and N—H...O hydrogen bonds, forming layers parallel to (100). An intra­molecular N—H...O hydrogen bond is also observed.
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