title: 2,2'-[(1E,2E)-1,2-Bis(hy-droxy-imino)-ethane-1,2-di-yl]dipyridinium hexa-chloridorhenate(IV).
abstract: The title salt, (C(12)H(12)N(4)O(2))[ReCl(6)], consists of 2,2'-[(1E,2E)-1,2-bis-(hy-droxy-imino)-ethane-1,2-di-yl]dipyridinium cations and [ReCl(6)](2-) anions which are both located on inversion centres. Each cation consists of a glyoxime moiety attached to two protonated pyridine rings in ortho positions. In the crystal, E,E isomers of the cation are observed which differ in the spatial arrangement of the pyridine rings. These rings are positionally disordered over two positions with site-occupancy factors of 0.786 (7) and 0.214 (7). The geometry of the cation is compared with that of a recently reported dipyridyl-glyoxime with the same configuration. The cations and anions are involved in a network of inter-molecular O-H⋯Cl, N-H⋯Cl and C-H⋯Cl hydrogen bonds.
authors.affiliation: University of Wrocław, Faculty of Chemistry, 14 Joliot-Curie St, 50-383 Wrocław,  Poland.
authors.forename: Monika K
authors.initials: MK
authors.lastname: Krawczyk
authors.forename: Marta S
authors.initials: MS
authors.lastname: Krawczyk
authors.forename: Miłosz
authors.initials: M
authors.lastname: Siczek
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Lis