Crystal and molecular structure of tetra(methylsilicon) hexasulphide (1,3,5,7-tetramethyl-2,4,6,8,9,10-hexathia-1,3,5,7-tetrasila-adamantane)

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Abstract
The crystal structure of the title compound has been determined by single-crystal X-ray diffraction methods. Crystals are monoclinic, space group C2/c, with a= 9.382(10), b= 16.513(20), c= 10.584(11)Å, β= 107° 10(10)′, and Z= 4. The structure was solved by direct methods and refined by block-diagonal least-squares techniques to R 4.4% for 1 284 independent reflections measured by diffractometer. The molecule exhibits the crystallographically required C2 symmetry and approximates closely to Td(3m) symmetry like the corresponding Ge and Sn compounds. Mean molecular parameters in the adamantane-type structure are: Si–S 2.129, Si–C 1.836 Å; Si–S–Si 104.6, S–Si–S 111.8, and S–Si–C 107.0°. The Si valence angles show a smaller distortion from the tetrahedral value than do those at S. The molecular conformation and crystal packing are compared with that in other hexathia-adamantanes.

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