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Solid Sulfur Allotropes 23 Fig. 4 Molecular structure of the S8 molecule in orthorhombic a-sulfur with bond lengths in pm, bond angles (left) and torsion angles (right). The twofold screw axis of the molecule is indicated. Molecular parameters taken from [80]. The values of the bond lengths are those after correction for librational motion giving a mean of 205.5(2) pm in comparison with the uncorrected mean of 204.6(3) pm (Table 5) Table 5 Molecular structure parameters of the S8 molecule in a-, b-, and g-S8. The mean val- ues (standard deviations are in brackets) and the interval of the parameters are specified. Standard deviations have partially been calculated by the present authors Point symmetry Allotrope Bond lengths (pm) Range Bond angles () Range Torsion angles () Range Temperature (K) Reference 82m D4d a-S8 b-S8a o 204.6(3) 204.8(2.0) 203.8–204.9 200.9–207.7 108.2(6) 107.7(7) 107.4–109.0 106.2–108.9 98.5(19) 99.1(1.7) 96.9–100.8 95.9–101.5 298 218c [80] [27, 81] d 204.2(4.4) 194.8–213.4 108.3(1.6) 105.6–111.8 98.3(2.2) 94.3–102.4 g-S8b I 204.6(9) 203.7–206.0 108.0(4) 107.8–108.6 98.6(5) 98.0–99.2 ~300 [29, 30] II 204.5(9) 203.5–205.8 107.5(4) 107.1–108.0 99.4(5) 98.6–99.9 a The letters “o” and “d” refer to molecules of b-S8 at ordered and disordered positions, respectively b I and II refer to the two independent molecules of g-S8. Data taken from [30] c Data for the disordered structure above the transition temperature of Tc198 K taken from [27]PDF Image | Topics in Current Chemistry
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