title: Solvated and solvent-free forms of N,N'-dithiodiphthalimide.
abstract: N,N'-Dithiodiphthalimide, C16H8N2O4S2, crystallizes from ethyl acetate with two independent molecules in the asymmetric unit, in which the N-S-S-N torsion angles are -83.59 (19) and 92.9 (2) degrees. The molecules are linked by C-H...O hydrogen bonds and aromatic pi-pi-stacking interactions into a three-dimensional framework. When crystallized from either dichloromethane or ethanol, solvates are formed in which the molecules of the title compound lie across twofold rotation axes in space group C2/c, with N-S-S-N torsion angles of 93.54 (7) and 96.14 (11) degrees. There are no hydrogen bonds in these solvates, but the molecules are linked by aromatic pi-pi-stacking interactions into chains, between which there are continuous channels. Disordered solvent molecules occupy these channels, which account for ca 20% of the unit-cell volume.
authors.affiliation: Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB24 3UE, Scotland.
authors.forename: J M
authors.initials: JM
authors.lastname: Skakle
authors.forename: J L
authors.initials: JL
authors.lastname: Wardell
authors.forename: J N
authors.initials: JN
authors.lastname: Low
authors.forename: C
authors.initials: C
authors.lastname: Glidewell