title: Crystal structure of an organic-inorganic supra-molecular salt based on a 4,4'-methyl-enebis(3,5-dimethyl-1H-pyrazol-2-ium) cation and a β-octa-molybdate anion.
abstract: The asymmetric unit of the title compound, bis-[4,4'-methyl-enebis(3,5-dimethyl-1H-pyrazol-2-ium)] β-octa-molybdate, (C11H18N4)2[Mo8O26] or (H4mbdpz)2[Mo8O26], is composed of an H4mbdpz(2+) cation and half of the β-octa-molybdate anion which is completed by inversion symmetry. The organic mol-ecular units are engaged in a series of N-H⋯O hydrogen bonds with neighbouring anions, with N⋯O distances and N-H⋯O angles in the ranges 2.730 (2)-2.941 (2) Å and 122-166°, respectively. These inter-actions lead to the formation of a supra-molecular two-dimensional network parallel to the (010) plane.
authors.affiliation: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: Tatiana R
authors.initials: TR
authors.lastname: Amarante
authors.affiliation: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: Isabel S
authors.initials: IS
authors.lastname: Gonçalves
authors.affiliation: Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal.
authors.forename: Filipe A
authors.initials: FA
authors.lastname: Almeida Paz
keywords: 4,4′-methyl­enebis(3,5-dimethyl-1H-pyrazol-2-ium) cation; crystal structure; hydrogen-bonding network; β-octa­molybdate anion