A quarter of the unit cell volume of [{Ni(4,4′-dipy)(3-nitrobenzoate)2(MeOH)2}n], which crystallizes in the form of helices, is occupied by large chiral cavities (400–500 Å3). The cavities are capable of encapsulating not only single molecules, but also face-to-face dimers of nitrobenzene (see stick model). 4,4′-dipy=4,4′-bipyridine.
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Biradha et al. (1999) studied this question.