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Calixarene-based functional assemblies having potential for metal ion and/or molecular recognition were obtained: they are (1) gelators and (2) polymers. Calix [n] arenes bearing aliphatic chains at the p-position (2 n C m , n = 4, 6, and 8; m = 6, 12, and 18) have been synthesized by direct acylation from calix [n] arenes (1 m ) and serve as novel gelators of organic fluids. It has been established that the gelation process is thermally reversible, and the formation mechanism of the gels is ascribed to C─O…HO hydrogen bonding. On the other hand, insoluble polymer gels could also be obtained from a mixture of monovinyl- and divinyl-calix [4] arenes and they showed ion-selective swelling.
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Kawabata et al. (1993) studied this question.
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