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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(1 H -tetra­zol-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 tetra­zole 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 dimethyl­ammonium cations, which inter­act with the anionic complexes  via  N—H⋯N and N—H⋯Cl hydrogen bonds.

Tetrakis(dimethylammonium)trans-dichloridobis[5,5′-(pyrazine-2,3-diyl)bis(1H-tetrazol-1-ido-κN1)]copper(II)

Tetrakis(dimethylammonium)trans-dichloridobis[5,5′-(pyrazine-2,3-diyl)bis(1H-tetrazol-1-ido-κN¹)]copper(II)