N-ethyldithiophthalimide, the first structure of a dithiophthalimide derivative

The title compound, C10H9NS2, represents the first structurally studied der ivative of dithiophthalimide. The C=S bond lengths are 1.629 (3) and 1.637 (3) Angstrom; other geometric parameters are very close to the analogous va lues observed in the phthalimide structures. The least-square planes of the dithiophthalimide parts of the molecules in the crystal are parallel; thes e parts do not form any short contacts, leaving space for the ethyl groups pointing out of the plane [the 'out-of-plane torsion angles' C-N-C-C being equal to 90.7 (4) and -91.6 (4)degrees].