Abstract: | The title compound, (C10H10N2S)[CuCl4], was obtained by the reaction of cupric chloride with pyridine‐4‐thiol in a mixture of acetonitrile and tetrahydrofuran, suggesting that the desulfurization and coupling reactions of pyridine‐4‐thiol occurred in the presence of the Cu2+ ion. X‐ray diffraction analysis reveals the presence of one 4,4′‐thiodipyridinium cation, H2bps2+, and one [CuCl4]2− anion. The cations interact with the anions via N—H⋯Cl hydrogen‐bonding interactions to form a closed `chair' conformation. |