A void apart! A clathrate based on zinc octa(2,6-diisopropylphenoxy)phthalocyanine contains solvent-filled voids of exceptionally large volume (>8 nm3; see picture for the packing arrangement). Each nanovoid is enclosed by a cubic assembly of six phthalocyanine molecules and contains 18 molecules of water and an estimated 65 molecules of acetone, which may be exchanged for methanol or water molecules without loss of order.
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McKeown et al. (2005) studied this question.
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