The long-range goals of this project are to use polypyrrole-based anion receptors to understand the fundamental factors that regulate anion recognition and transport processes in biology and to develop synthetic systems that are useful in the diagnosis and treatment of human disease. This two-year project is concerned specifically with 1) the design of high- affinity receptors that will allow for anion recognition in the presence of water, especially those targeting chloride and phosphate, and 2) using these agents to create new polymeric systems with anion-specific recognition properties and demonstrating that these latter polymers may be used for the sequestration of phosphate and other anions under interfacial conditions. The focus will be on calixpyrrole and pyrrole-amide receptors that rely on multiple donor sets and which take advantage of new anion recognition motifs (e.g., CH-anion hydrogen bonds, localized charges,and ion-pairing interactions) and controlled geometries (achieved through strapping one receptor face, for instance) to achieve the requisite high affinity while still. Permitting functionalization and polymerization. The expectation is that by the time this two-year project is complete, a new set of polymerbased extractants will be in hand that could then be developed further for eventual use in the control of end-stage renal disease, where phosphate anion removal represents an important unsolved problem.
This project is concerned with the synthesis and study of anion receptors. Anions are ubiquitous in the biological world and thus directly related to human health. This ongoing program of research has its emphasis on the synthesis and study of new pyrrole-based anion receptors, as well as polymers containing these kinds of anion-binding recognition units. The synthesis and study of these latter polymers are the focus of this two-year project; if developed as proposed they are expected to allow for the extractive removal of so-called hard anions, such as chloride and phosphate, that are at the root of a number of diseases, and, in the case of phosphate, are a recognized problem during hemodialysis. This work is thus expected not only to improve our understanding of these anions, but also to lay the foundation for improvements in human health, particularly in the control of end-stage renal disease.
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