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

Abstract  

Two new salts based on Ni(tdas)₂]²⁻ (tdas²⁻ = 1,2,5-thiadiazole-3,4-dithiolate) anion, Bz4EtPy]₂Ni(tdas)₂] (1) and 4ClBz4EtPy]₂Ni(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-(4′-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]²⁻ anion in which the anion exhibits a quasi-planar structure. The crystals of 1 and 2 are stabilized through C–H···S and C–H···Ni hydrogen bonds, π···π stacking interactions and S···Cl short interactions.