Structural Diversity of Methyl-Substituted Inclusion Complexes of Calix[5]arene
Crystal Growth & Design2007Vol. 7(10), pp. 2059–2065
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Thomas E. Clark, Mohamed Makha, Alexandre N. Sobolev, Scott J. Dalgarno, Jerry L. Atwood, Colin L. Raston
Abstract
The three isomers of xylene form inclusion complexes with p-H-calix[5]arene with different spatial interplay of the cavitands, which is relevant to using crystallization as a means of separating mixtures of o-, m-, and p-xylenes. Competition experiments involving mixtures of o-/m-xylene, o-/p-xylene, and m-/p-xylene and a mixture of all three isomers showed some selectivity in the inclusion of the xylenes with p-H-calix[5]arene according to the inequality m- > o- > p-xylene. Also reported are the toluene and mesitylene solvates, which are isostructural with the o-xylene and m-xylene inclusion complexes, respectively.
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