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48 Ralf Steudel · Bodo Eckert Fig. 18 Schematic view of the crystal structure of Sw2 (=2nd fibrous sulfur or Sy) along the c-axis showing the handedness of the helices [8] Fig. 19 Schematic view of the crystal structure of Sw2 (=laminar sulfur or Sc) along the b-axis showing the “cross-grained plywood” arrangement of the helices (after [8, 54]) Tuinstra proposed the name “2nd fibrous sulfur” or Sy0 for the Sw1 modifica- tion [115]. On the other hand, the structure of Sw2 was reported as tetragonal with the helices perpendicular to the c-axis of the unit cell (Table 20). The only reasonable possibility in structure determination was the one in which adja- cent layers of helices are oriented perpendicular to each other. The helices of the layers have the same molecular structure and all the helices in one layer have the same handedness. The closest packing of the helices is achieved if the molecules of parallel layers have opposite turns (see Fig. 19). This struc- ture is unusual but not unlikely since the pitch of the sulfur helix is the same as the intermolecular distance of neighboring helical axes, about 460 pm (see Table 20). The structure of Sw2 is a “cross-grained plywood structure”. This peculiarity has caused Tuinstra to label this modification “laminar sul- fur” (Sc).PDF Image | Topics in Current Chemistry
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