Two new salts based on [Ni(tdas) 2 ] 2¡ (tdas 2¡ D 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] (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] C cations in 1 form a 1D chain through C¡H¢¢¢F hydrogen bonds, while the [Ni(tdas) 2 ] 2¡ anions form a 1D chain in 2 through intermolecular short S¢¢¢S interactions. Some other intra-molecular contacts such as C¡H¢¢¢S, C¡H¢¢¢N, C-H¢¢¢Ni, p¢¢¢p, S¢¢¢N, and S¢¢¢Br 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.
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