title: Crystal structure of bis-(1-hexyl-N,N-di-methyl-pyridinium) bis-(maleo-nitrile-dithiol-ato)nickelate(II).
abstract: The asymmetric unit of the title compound, (C13H23N2)2[Ni(C4N2S2)2], consists of a 1-hexyl-N,N-di-methyl-pyridinium cation and one half of a [Ni(mnt)2](2-) dianion (mnt(2-) = maleo-nitrile-dithiol-ate) in which the Ni(2+) cation lies on a crystallographic inversion centre. The square-planar coordination about Ni(2+) comprises four S atoms from two bidentate chelate mnt(2-) ligands [Ni-S = 2.1791 (9) and 2.1810 (8) Å, and S-Ni-S bite angle = 91.93 (3)°]. The hydro-carbon chains of cations show trans-planar conformations and lie approximately parallel to the long mol-ecular 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.
authors.affiliation: Department of Environmental Science, Nanjing Xiaozhuang College, Nanjing 211171, People's Republic of China; Huabao Food Flavor & Fragrance (Shanghai) Co., Ltd, Shanghai, 201821, People's Republic of China.
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Yu
authors.affiliation: Department of Environmental Science, Nanjing Xiaozhuang College, Nanjing 211171, People's Republic of China; Huabao Food Flavor & Fragrance (Shanghai) Co., Ltd, Shanghai, 201821, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
keywords: crystal structure; hydro­carbon chain; maleo­nitrile­dithio­late; synthesis