A unique step-by-step activation of the biporous material via formation of the intermediate host-guest complex with a labile ligand has been presented on the example of the metal-organic framework [Zn4(ur)2(ndc)4]. The difference in the chemical environment of channels allows highly selective separation of the mixture of S4N4 and benzene.
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Sapchenko et al. (2013) studied this question.
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