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The solid-state structures of the complexes of calix[4]arenediphosphonic acid with piroxicam and 9-aminoacridine are described, in both cases, the classical interdigitated dimer formed by calix[4]arenediphosphonic acid is no longer present. For the 9-aminoacridine complex, a π–π stacked dimer of 9-aminoacridine is surrounded by calix[4]arenediphosphonic acid molecules with dimethyl sulfoxide included...
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