Caging cages: Crystals of a metal-organic framework, MOF-123 [Zn7O2(NBD)5(DMF)2] have a three-dimensional porous structure in which DMF ligands (see picture, pink) protrude into small channels. Removal of these ligands triggers the transformation of this MOF to the doubly interpenetrating form, MOF-246 [Zn7O2(NBD)5]. Moreover, addition of DMF into MOF-246 triggers reverse transformation to give MOF-123. NBD=2-nitrobenzene-1,4-dicarboxylate.
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Choi et al. (2012) studied this question.
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