Synthesis, Characterization, Weak Interactions, and 3D Crystal Structures of Two New Salts Based on Bis(1,2,5-thiadiazole-3,4-dithiolate)nickelate Anion with 4-Substituted Benzyl 4-Ethylpyridinium Derivatives

Two new salts based on [Ni(tdas)(2)](2-) (tdas(2-) = 1, 2, 5-thiadiazole-3,4-dithiolate), [4FBz-4EtPy](2)[Ni(tdas)(2)](1) and [4BrBz-4EtPy](2)[Ni(tdas)(2)] (2), have been prepared by reaction of Na(2)tdas, NiCl(2)(.)6H(2)O, and [4RBz-4EtPy]Br([4RBz-4EtPy](+) = 4-R-benzyl-4-ethylpyridinium, R = F(1), Br(2)), and characterized by elemental analysis, IR, UV-Vis, EI-MS spectra, and single-crystal X-ray diffraction. Two salts crystallize in different systems with the different stacking modes of the anions and the cations. The [4FBz-4EtPy](+) cations in 1 form a 1D chain through C-HF hydrogen bonds, while the [Ni(tdas)(2)](2-) anions form a 1D chain in 2 through intermolecular short SS interactions. Some other intra-molecular contacts such as C-HS, C-HN, C-HNi, , SN, and SBr weak interactions in 1 and 2 play an important role in the stacking of the molecules and give further rise to a network 3D structure.