Polyammonium cryptands

Polyammonium cryptands and tricyclic lactams probably represent the largest family of cryptand-type anion receptors known today and a detailed overview of the properties of these compounds lies outside the scope of this review. The interested reader is therefore referred to two recent reviews [11, 53]. Compound 35b in the following section is the only polyammonium cryptand besides 5 whose properties are described in this review in more detail to illustrate the effect of the incorporation of additional hydrogen bond acceptor sites on binding properties. 

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