C6H4S2AsCl: description and interpretation of an incommensurately modulated molecular crystal structure

Bakus II, R.C.; Atwood, D.A.; Parkin, S.; Brock, C.P.; Petricek, V.

doi:10.1107/S205251921301782X

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 6
Two views of a superposition of the dimer ribbon for superstructure approximation (I) (red) and (II) (blue); the overlap of the two approximations is so good that it is difficult to distinguish the red and blue drawings. Fifteen dimers of each are shown, with the top nine unique for approximation (I) and the bottom nine unique for (II). The Cl atoms next to the inversion centers within the dimers (lower half of the drawing) and between the dimers (upper half of the drawing) are shown as small spheres. The two models can be superposed very well, but the crystallographic inversion centers are displaced by five dimers between the two models. The (S₂C₆),( $[\overline 1]$ $[\overline 1]$ 4)₁₇ angle for the dimer that lies on an inversion center is quite different for the two models. The crystallographic inversion centers in one superstructure approximation are approximate inversion centers in the other.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 69| Part 5| September 2013| Pages 496-508

doi:10.1107/S205251921301782X

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