5,5′-Dimethyl-2,2′-dithiodi-1,3,4-thiadiazole

The title compound, C6H6N4S4, is formed through the thionato S—S bonding of parent 2-mercapto-5-methyl-1,3,4-thia­diazole mol­ecules, following the deprotonation of thiol groups in a mixed solvent. The title compound crystallizes in the monoclinic system, space group C2/c. The S—S distance is 2.028 (1) A, typical of a single bond. The two 1,3,4-thia­diazo­le rings in the mol­ecule each remain planar, with a dihedral angle of 70.5 (1) A, and are related by a twofold rotation axis through the middle of the S2—S2 bond. The geometric parameters for the parent ligand are also reported, to demonstrate the influence of deprotonation on the ligand dimensions.