Abstract
In the title molecular salt, (C10H10N3)(2)[Ni(CN)(4)], the dihedral angle between the pyridine rings in the cation is 1.92 (13)degrees and the complete anion is generated by a crystallographic centre of symmetry. An intramolecular N-H center dot center dot center dot N hydrogen bond occurs in the cation, which closes an S(6) ring. In the crystal, the components are linked by N-H center dot center dot center dot N and weak C-H center dot center dot center dot N hydrogen bonds, which generate chains propagating in the [101] direction. Weak aromatic pi-pi stacking interactions are also observed. A Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the most important contact types in the crystal packing are N center dot center dot center dot H/H center dot center dot center dot N, C center dot center dot center dot H/H center dot center dot center dot C and H center dot center dot center dot H with contributions of 37.2, 28.3 and 21.9%, respectively.