title: A triclinic modification of 5,5'-dinitro-2,2'-dithio-dipyridine.
abstract: The asymmetric unit of the title compound, C(10)H(6)N(4)O(4)S(2), contains two independent but similar mol-ecules. The structure is a triclinic polymorph of the monoclinic structure reported previously [Brito, Mundaca, Cárdenas, López-Rodríguez & Vargas (2007 ▶). Acta Cryst. E63, o3351-o3352]. The most obvious difference between the two polymorphs is the C-S-S-C torsion angle [-80.13 (16), -79.8 (2) and 0° for the two mol-ecules of the triclinic polymorph and the monoclinic polymorph, respectively]. The crystal structure of the title compound has two intra-molecular C-H⋯S inter-actions with average H⋯S distances of 2.69 Å, whereas this kind of inter-action is not evident in the monoclinic polymorph.
authors.forename: Iván
authors.initials: I
authors.lastname: Brito
authors.forename: Aldo
authors.initials: A
authors.lastname: Mundaca
authors.forename: Alejandro
authors.initials: A
authors.lastname: Cárdenas
authors.forename: Matías
authors.initials: M
authors.lastname: López-Rodríguez