Not interpenetrated, but filled with solvent molecules, the large cavities of the polymer [Co(NO3)2(4,4′-bpy)1.5]n form different structures depending on the solvent system from which it crystallizes. One of the two possible structures (section of structure shown on the right) exhibits hydrophobic cavities about 11 × 11 Å in size. The solvent molecules can be readily removed, but the process has not yet been proven reversible.
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Losier et al. (1996) studied this question.
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