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The title compound, (C2H10N2)2[(C10H12N2O8)(MoO3)2]·4H2O, which crystallizes in the monoclinic C2/c space group, was obtained by mixing molybdenum oxide, ethylenediamine and ethylenediaminetetraacetic acid (H4edta) in a 2:4:1 ratio. The complex anion contains two MoO3 units bridged by an edta4− anion. The midpoint of the central C—C bond of the edta4− anion is located on a crystallographic inversion centre. The independent Mo atom is tridentately coordinated by a nitrogen atom and two carboxylate groups of the edta4− ligand, together with the three oxo ligands, producing a distorted octahedral coordination environment. In the three-dimensional supramolecular crystal structure, the dinuclear anions, the organoammonium counter-ions and the solvent water molecules are linked by N—H...Ow, N—H...Oedta and O—H...O hydrogen bonds.

In the title salt, (C8H20N)8[Mo10O34], the [Mo10O34]8− polyanion is located about an inversion centre and can be considered as a β-type octamolybdate anion to which two additional MoO4 tetrahedra are linked via common corners. The [Mo10O34]8− polyanions are packed in rows extending parallel to [001] and are connected to the dibutylammonium counter-cations through N—H...O hydrogen-bonding interactions.

In the anion of the title molecular salt, C6H16N+·C6H5O3S−, the O atoms of the sulfonate group is rotationally disordered over two sets of sites in a a 0.711 (9):0.289 (9) ratio. The extended structure displays N—H...O hydrogen bonds between the cation and anion, which results in infinite chains propagating parallel to [010]. The chains are linked by weak C—H...O interactions, yielding a two-dimensional network.

In the crystal of the title molecular salt, C6H16N+·C8H5O4−, the cation and anions are linked into [010] chains by N—H...O hydrogen bonds. The chains are connected to their neighbours through weak C—H...O hydrogen bonds, leading to a layered supramolecular architecture. The hydrogen phthalate anion exhibits an intramolecular O—H...O hydrogen bond in which the H atom is approximately equidistant to the two O atoms.

The title compound, [Sn{C6H4(OH)COO}(C6H5)3{OP(C6H5)3}], is comprised of discrete molecules with the SnIV atom in a trigonal–bipyramidal coordination environment. The carboxylate O atom of the salicylate anion and the O atom of the triphenylphosphine oxide moiety are in the axial positions and the three ipso C atoms occupy the equatorial positions. An intramolecular O—H...O hydrogen bond is present in the anion between the hydroxy group and the carbonyl atom O of the carboxylate group.