Bis(3,5,7-triaza-1-azoniatricyclo­[3.3.1.1(3,7)]deca­ne) bis­(1,2-dicyano­ethene-1,2-dithiol­ato)nickelate(II)

The asymmetric unit of the title complex, (C(6)H(13)N(4))(2)[Ni(C(4)N(2)S(2))(2)], comprises one 1-azonia-3,5,7-triaza­tricyclo­[3.3.1.1(3,7)]decane cation and one half of an [Ni(mnt)(2)](2−) (mnt(2−) is maleonitrile­dithiol­ate or 1,2-dicyano­ethene-1,2-dithiol­ate) dianion. The Ni(2+) ion is located on a center of inversion and is coordinated by four S atoms from two mnt(2−) ligands in a square-planar coordination mode. Inter­molecular N—H⋯N hydrogen-bond inter­actions link one anion and two cations in the crystal structure.