Controlling Structure Beyond the Initial Coordination Sphere: Complexation-Induced Reversed Micelle Formation in Calix[4]pyrrole-Containing Diblock Copolymers

A diblock copolymer containing a
strapped calix[4]­pyrrole-based
ion pair recognition subunit has been synthesized via RAFT polymerization.
As prepared, the polymer is hydrophobic and devoid of any particular
morphological form. However, upon ion pair complexation, the copolymer
self-assembles to generate reverse micelles in organic media. The
reverse micelles formed in this way may be used to extract alkali
cation and cesium halide anion salts from an aqueous source into an
organic receiving phase. The polymer proved more effective as an extractant
than the corresponding free ion pair receptor.