作者:Anthony Linden、Agnieszka Majchrzak、Jovita Cavegn、Grzegorz Mloston、Heinz Heimgartner
DOI:10.1107/s0108270102011319
日期:2002.8.15
The four oligosulfanes, bis(1-chloro-2,2,4,4-tetramethyl-3-oxocyclobutan-1-yl)disulfane, C16H24Cl2O2S2, (III), 1,3-bis(1-chloro-2,2,4,4-tetramethyl-3-oxocyclobutan-1-yl)trisulfane, C16H24Cl2O2S3, (V), 1,4-bis(1-chloro-2,2,4,4-tetramethyl-3-oxocyclobutan-1-yl)tetrasulfane, C16H24Cl2O2S4, (VII), and 1,6-bis(1-chloro-2,2,4,4-tetramethyl-3-oxocyclobutan-1-yl)hexasulfane, C16H24Cl2O2S6, (VIII), all have similar geometric parameters, with the C-C bond lengths involving the chloro-substituted cyclobutanyl C atom being elongated to about 1.59 Angstrom. There are two molecules in the asymmetric units of the tri- and tetrasulfanes, and the molecules in the latter compound have local C-2 symmetry. The molecule of the hexasulfane has crystallographic C-2 symmetry. Most of the cyclobutanyl rings are not perfectly planar and have slight but varying degrees of distortion towards a flattened tetrahedron. The polysulfane chain in each structure has a helical conformation, with each additional S atom in the chain adding approximately one quarter of a turn to the helix.