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36 Ralf Steudel · Bodo Eckert Fig. 13 Molecular conformation of the S14 molecule in the crystal (symmetry Cs) Table 14 Molecular structure parameters of crystalline S14 at 173 K [46] Point group of molecule Av. bond length (pm) Range Av. bond angle () Range Av. torsion angle ()a Range a Absolute values 2.2.1.10 Triclinic S14 m–Cs(C1h) 205.3 204.7–206.1 106.3 104.0–109.3 93.1 72.5–101.7 Although cyclo-tetradecasulfur has been observed in trace amounts by HPLC investigations of quenched sulfur melts and synthetic mixtures of sulfur in the 1980s, single crystals of S14 were obtained just a few years ago by Steudel et al. [46]. The authors reported results of X-ray structural and Raman spec- troscopic studies of crystalline S14 which forms deep-yellow, rod-like bun- dles of crystallites. The space group of crystalline S14 is P1 Ci1 (no. 2) of the triclinic crystal system. The lattice parameters are a=546.9(3) pm, b=966.2(5) pm, c=1433.1(7) pm, a=95.97(4), b=98.96(4), g=100,43(4) at 173 K [46]. The unit cell contains two molecules of approximate Cs symmetry with a mirror plane as the only symmetry element intersecting atoms S2 and S9 (Fig. 13). The molecular structure data are summarized in Table 14. The average bond length is close to those of S8 and S12. The average torsion angle of about 93 accounts for the stability of S14, which is in the range of several days at roomPDF Image | Topics in Current Chemistry
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