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Solid Sulfur Allotropes 31 Fig. 10 Two views of the crystal structure of the sulfur allotrope S6·S10 [35] cules per unit cell. The lattice parameters are a=1954.1(8) pm, b=943.1(3) pm, c=883.1(3), and b=105.11(3) (Fig. 10). The molecules S6 and S10 in S6·S10 exhibit the same molecular conforma- tions as in the pure crystals of S6 (D3d) and of S10 (D2). However, the molecu- lar parameters of S6 in S6·S10 show a slight variation of less than 1% of the mean values in the case of the bond and torsion angles and less than 0.1% in the case of the internuclear distances. As in pure S10 both enantiomorphic molecules are present in S6·S10 in equal amounts. The site symmetry of S10 in S6·S10 is C2 as in pure S10. However, the site symmetry of the S6 molecules in S6·S10 is reduced to Ci in comparison with C3i in pure S6. The mean bond parameters of S6 and S10 are almost identical in S6·S10 compared to the pure components (Table 10). The four shortest intermolecular distances (339.9–345.2 pm) were found between S6 and S10 molecules. Although these contacts are closer in compar- ison with other allotropes like the more dense S6 crystal, the density of S6·S10 is halfway between the densities of the pure allotropes of S6 and S10, respec- tively (see Table 22 below).PDF Image | Topics in Current Chemistry
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