Topics in Current Chemistry

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Topics in Current Chemistry ( topics-current-chemistry )

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28 Ralf Steudel · Bodo Eckert Fig. 8 The “sheared penny roll” structure of monoclinic g-S8 projected down to the b-axis [78] Table 8 Crystal structure data of g-S8 at about 300 K (standard deviations are in brackets). There are four (two) molecules per unit (primitive) cell [30] Space group Site symmetry Lattice constants a (pm) b (pm) c (pm) b (􏰹) P2/c􏱐C2h4 (no. 13) 2􏱐C2 845.5(3) 1305.2(2) 926.7(3) 124.89(3) confirmed. The space group is P2/c–C2h4. The molecules form a pseudo- hexagonal close-packed structure. The asymmetric unit consists of two half S8 units in which the two independent molecules have a twofold crystallo- graphic symmetry. The differences of the bond lengths around the S8 ring are significant and the variation of the bond lengths is much larger than in a-S8 and b-S8. The shortest intermolecular distance of about 345 pm is close to the values found for the a-, and the b-modification of octasulfur. The molecular packing effi- ciency in g-S8 is comparable to that of a-S8. The crystal structure data are given in Table 8.

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