Polymorphism study of a three-component system showing encapsulation of ion pairs and a zwitterion

Abstract

Two rare three-component polymorphs have been prepared that adopt different molecular recognition models: brick-wall and herringbone frameworks. Both the polymorphs also exhibit an interesting inclusion phenomenon wherein the guest molecules are in fact ion pairs. The crystal structure of 3, on the other hand, represents a unique inclusion feature of encapsulation of a zwitterion.