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32 Ralf Steudel · Bodo Eckert Table 10 Mean values of molecular structure data of S6 and S10 in S6·S10 and in the pure al- lotropes at 163 K [35] Molecule S6 S10 Allotrope S6a S6·S10 Bond length (pm) 206.8 206.2 Bond angle () 102.6 102.6 Torsion angle ()b 73.8 73.8 a Data of crystalline S6 at 183 K from [65] b Mean of absolute values of the torsion angles S10 S6·S10 205.6 205.8 106.2 106.3 95.7 96.2 Fig. 11 Comparison of the molecular conformations of S11 (symmetry C2), S12 (symme- try D3d), and S13 (symmetry C2) [38] 2.2.1.7 Orthorhombic S11 The preparation of cyclo-undecasulfur was first reported by Sandow et al. in 1982 [36]. Results of an X-ray structural analysis of a single crystal of S11 were published by Steidel et al. in the same year [37] and by Steudel et al. in 1986 [38]. Crystals of S11 are yellow, rod-like and of rhombic-bipyramidal shape. The unit cell contains eight molecules, although there are only two inde- pendent molecules in the asymmetric unit which occupy sites of C1 symme- try. The crystal system is orthorhombic (space group Pca21–C2v5, no. 29) with lattice parameters a=1493.3(10), b=832.1(5), and c=1808.6(12) pm at about 163 K. The molecular symmetry, however, is approximately C2 with a twofold rotation axis as the only element of symmetry (see Fig. 11). As a typ- ical odd-membered ring S11 shows an unusually large bond of about 211 pmPDF Image | Topics in Current Chemistry
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