Stacks of acids: Pentafluorobenzoic acid forms heterodimers with benzoic acid and 2,4,6-trimethylbenzoic acid that assemble into π stacks with alternating phenyl and pentafluorophenyl residues (see picture). Cocrystals of these acids with 1,4-bisarylbutadiynes contain acid homodimers sandwiched between the diacetylene molecules.
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Gdaniec et al. (2003) studied this question.
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