Bis(ethyl-enedi-ammonium) µ-ethyl-enedi-aminetetra-acetato-1κ3 O,N,O':2κ3 O'',N',O'''-bis-[tri-oxidomolybdate(VI)] tetra-hydrate.

The title compound, (C2H10N2)2[(C10H12N2O8)(MoO3)2]·4H2O, which crystallizes in the monoclinic C2/c space group, was obtained by mixing molybdenum oxide, ethyl-enedi-amine and ethyl-enedi-amine-tetra-acetic 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 coordin-ated by a nitro-gen atom and two carboxyl-ate groups of the edta4- ligand, together with the three oxo ligands, producing a distorted octa-hedral coordination environment. In the three-dimensional supra-molecular crystal structure, the dinuclear anions, the organo-ammonium counter-ions and the solvent water mol-ecules are linked by N-H⋯Ow, N-H⋯Oedta and O-H⋯O hydrogen bonds.

Di-propyl-ammonium 4-amino-benzene-sulfonate.

In the title mol-ecular salt, NH2(C3H7)2 +·[NH2C6H4SO3]-, the cation displays an extended conformation. In the crystal, anion-to-anion N-H⋯O and N-H⋯(O,O) hydrogen bonds generate (101) layers. Cation-to-anion N-H⋯O hydrogen bonds connect the layers into a three-dimensional network.

Crystal structure of di-ethyl-ammonium aniline-4-sulfonate anilinium-4-sulfonate.

The title compound, C4H12N+·C6H6NO3S-·C6H7NO3S, consists of an ion pair and a zwitterionic neutral mol-ecule. The cation adopts an extended conformation [C-C-N-C torsion angles = 177.1 (3) and -178.4 (3)°]. In the crystal, the components are linked by N-H⋯O and N-H⋯N hydrogen bonds, generating a three-dimensional network, which is consolidated by weak C-H⋯O inter-actions.