Topics in Current Chemistry

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Topics in Current Chemistry ( topics-current-chemistry )

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Solid Sulfur Allotropes 51 Fig. 20 Dependence of the S-S bond distance in sulfur homocycles on the torsion angle tSS. Experimental values are shown by open triangles, values obtained by MD calcula- tions are shown by full circles [67] Fig. 21 Relationship between the bond lengths in sulfur rings S5 to S13 indicating strong bond-bond interactions. The bond length d2 is plotted as a function of the two neigh- boring bonds, 1/2(d1+d3), see the inset. Experimental values are shown by open triangles, MD calculated values by full circles [67] In the crystalline state, the site symmetry is in general lower than the symmetry of the free molecule. The preferred lattice structures of sulfur ho- mocycles are of the orthorhombic and monoclinic crystal systems. The mo- lecular packing arrangements of the solid allotropes are quite different. In orthorhombic S12, for example, the asymmetric unit is given by one quarter

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