[C4H11N8NiO4]+[C12H4N4]-, Mr = 498.09 is triclinic, P1̄, a = 3.7718(6), b = 7.436(2), c = 17.511(4) Å, α = 88.67(2), β = 86.93(2), γ = 85.05(2)°, V = 488.51 Å3, Z = 1, dc = 1.69 gcm-3, final Rw = 0.035 for 1454 observed independent reflections. The crystals consist of segregated regular parallel stacks of planar metal complex cations and tenq- counterions with intermolecular H bonds stabilizing the structure. The compound is metallic at room temperature. A metal to semiconductor transition around 230 K shows up in thermopower data, in the microwave conductivity and epr around 170 K. It is not visible in the static magnetic susceptibility.
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Endres et al. (1985) studied this question.