title: Tetra-kis(dimethyl-ammonium) trans-di-chloridobis[5,5'-(pyrazine-2,3-diyl)bis(1H-tetra-zol-1-ido-κN(1))]copper(II).
abstract: The title compound, (C(2)H(8)N)(4)[Cu(C(6)H(2)N(10))(2)Cl(2)], consists of an anionic complex which is composed of a Cu(II) ion surrounded by four N atoms from two pyrazine-2,3-diylbis(1H-tetra-zol-1-ide) ligands, and two Cl(-) atoms in a trans-Cl(2)N(4) coordination geometry; the Cu(II) atom lies on a site of symmetry 2/m. The Cu-Cl distance of 2.8719 (5) Å is long due to the Jahn-Teller distortion of the d(9) electron configuration of Cu(II) ion. The tetra-zole and pyrazine rings make an N-C-C-N torsion angle of 38.25 (17)°. The charge of the anionic complex is balanced by four dimethyl-ammonium cations, which inter-act with the anionic complexes via N-H⋯N and N-H⋯Cl hydrogen bonds.
authors.affiliation: Department of Chemistry and Biochemistry, National Chung Cheng University, 168 University Road, Min-Hsiung, Chia-Yi,  Taiwan.
authors.forename: Ju-Hsiou
authors.initials: JH
authors.lastname: Liao
authors.forename: Pei-Shan
authors.initials: PS
authors.lastname: Shi