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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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In the title compound, (C9H8N)4[Te2V8O28]·8H2O, the com­plete heteropolyanion is generated by a crystallographic inversion centre. One of the two quniolinium ions forms an N—H...Op (p = polyoxidometallate) hydrogen bond and the other an N—H...Ow (w = water) hydrogen bond. The water mol­ecules further link the components by O—H...Op and O—H...Ow hydrogen bonds. A number of C—H...O inter­actions and aromatic π–π stacking inter­actions [shortest centroid–centroid separation = 3.541 (7) Å] are also observed. Together, these generate a three-dimensional network.
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