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Figure 7
Top–down (upper row) and side-view of a pair of contiguous rings in a stack: (a) hydrogen chloranilate anions in potassium hydrogen chloranilate dihydrate (Molčanov et al., 2009aBB20) stack in a nearly eclipsed fashion; (b) hydrogen bromanilate anions in RbHBA·3H2O form a staggered arrangement; (c) bromanilate dianions in K2BA·2H2O form offset stacks with a geometry similar to aromatic π-interactions. The hydrogen bromanilate rings are not offset at all, whereas a very small offset (∼ 0.2 Å) occurred in hydrogen chloranilate stacks. Offset of bromanilate dianions is necessary to prevent π⋯π repulsions between π bonds from contiguous rings (e.g. C—O). H atoms of OH groups are not shown due to a disorder.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 68| Part 1| February 2012| Pages 57-65
https://doi.org/10.1107/S0108768111051159
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