“…In each of N-(2-nitrophenylthio)phthalimide, (I) (Iwasaki & Masuko, 1986), N-(2-nitrophenylthio)succinimide, (II) (Low et al, 2000), and N-(2-nitrophenylthio)saccharin, (III) (Glidewell et al, 2000a), the molecular conformations are dominated by the near orthogonality of the lone pairs at N and S. Similarly, in diaryl disul®des, RSSR H , the molecular conformations are dominated by the near orthogonality of the lone pairs on the two adjacent S atoms (Glidewell et al, 2000b). Developing these earlier studies, and combining the themes of lone-pair orthogonality in >NÐS± and ±SÐS± pairs, we have now investigated the structure of N,N H -dithiodiphthalimide, (IV), where the central NÐSÐSÐN fragment comprises four contiguous atoms bearing lone pairs with those on adjacent atoms expected to be pairwise orthogonal.…”