This presentation will provide a summary of our recent efforts to create receptors for ion pairs. Particular emphasis has been placed on the development of pyrrolic and other macrocyclic systems that permit the specific recognition and competitive extraction of hard ions, such as the lithium cation and the hydroxide and carbonate anions. Studies of softer ions, such as the cesium cation, as an ion pair component have also been carried out. Using ion pair recognition, an effort has been made to control structure beyond the first coordination sphere. This has been done by creating systems whose polarity and hence morphology changes as a function of ion recognition, allowing for control over, e.g., micelle formation. Toward this end, responsive polymeric systems that permit the capture of dianions and hydroxide anion have been the subject of attention. Separately, several responsive recognition systems have been prepared with the view to being able to bind and release complex anions that have traditionally proved difficult to capture using synthetic receptors, including halide anion salts of lithium and various hydroxide anion salts. The creation of gels for ion capture is a topic of current interest and new results relating to those efforts will be presented as appropriate.

Macrocycle-based ion pair receptors

ACS Spring Meeting 2021

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