Two New Salts Based on Bis(1,2,5-thiadiazole-3,4-dithiolate)nickelate Anion with Substituted Benzyl 4-ethylpyridinium: Syntheses, Crystal Structures and Properties

Two new salts based on [Ni(tdas)2] 2(tdas = 1,2,5-thiadiazole-3,4-dithiolate) anion, [Bz4EtPy]2[Ni(tdas)2] (1) and [4ClBz4EtPy]2[Ni(tdas)2] (2), have been prepared by reaction of Na2tdas, NiCl2 6H2O, and [Bz4EtPy]Br ([Bz4EtPy] = 1-benzyl-4-ethylpyridinium) or [4ClBz4EtPy] Br ([4ClBz4EtPy] = 1-(40-chlorobenzyl)-4-ethylpyridinium), and characterized by elemental analyses, UV, IR, MS spectrum, molar conductivity and single crystal X-ray diffraction. Single-crystal X-ray diffraction analyses indicate that the two salts crystallize in a triclinic system with space group P-1. The unit cell contains two [Bz4EtPy]/[4ClBz4EtPy] and one [Ni(tdas)2] 2anion in which the anion exhibits a quasiplanar structure. The crystals of 1 and 2 are stabilized through C–H S and C–H Ni hydrogen bonds, p p stacking interactions and S Cl short interactions.