Crystal and molecular structure of dimorpholinotetrasulphane

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The tetrasulphane S4(NC4H8O)2 crystallizes in the tetragonal space group l41/a(no. 88) with a=b= 12.812(1), c= 16.733(2)A, and Z= 8. The structure has been determined by X-ray diffraction from Mo-Kα diffractometer data and refined by full-matrix least squares to R 0.045 for 948 observed reflections. The molecules lie across crystallographic two-fold axes. The N–S–S–S–S–N chains occur in the trans-trans form, with N–S 1.668(3), S–S (terminal) 2.061(2), S–S (central) 2.078(3)A, N–S–S 109.1(2), S–S–S 105.8(1)°, NSS–SSS 90.3 and SSS–SSS 79.9°. The morpholine groups occur in the chair form, with N–S equatorial. The S–S bonds alternate only slightly in length along the chain, like the Se–Se bonds in the isomorphous tetraselane analogue.