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Figure 7
Stereoview of nitrate anions connecting two peptide columns in IIc. When one nitrate anion is in the B position, the adjacent nitrate must be in the C position to avoid steric conflict. For the nitrate pair this yields two alternative arrangements, both shown in this illustration. The view is along the twofold axis in space group P3121 (the short unit-cell diagonal), while the threefold screw axis is vertical.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 60| Part 5| September 2004| Pages 569-577
doi:10.1107/S0108768104014569
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