Crystal structure of bis(1-hexyl-N,N-dimethylpyridinium) bis(maleonitriledithiolato)nickelate(II)

The asymmetric unit of the title compound, (C13H23N2)2[Ni(C4N2S2)2], consists of a 1-hexyl-N,N-dimethylpyridinium cation and one half of a [Ni(mnt)2]2− dianion (mnt2− = maleonitriledithiolate) in which the Ni2+ cation lies on a crystallographic inversion centre. The square-planar coordination about Ni2+ comprises four S atoms from two bidentate chelate mnt2− ligands [Ni—S = 2.1791 (9) and 2.1810 (8) Å, and S—Ni—S bite angle = 91.93 (3)°]. The hydrocarbon chains of cations show trans-planar conformations and lie approximately parallel to the long molecular axis of the [Ni(mnt)2]2− anions, giving stacks along the c axis. The anions and cations form layers lying parallel to the bc plane. Only weak C—H...Ni and C—H...π associations are present in the crystal packing.

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