Fluoride is one of the most significant anions due to its critical role in dental care and treatment of osteoporosis; therefore, fluoride recognition by synthetic receptors is attracting a growing interest. Fluoride is a common anion in water but with higher concentrations in groundwater due to the presence of fluoride-bearing minerals. Because of duplicitous nature of fluoride, it is important to design receptors for extracting, and separating this particular anion from fluoride-bearing minerals or fluoride containing systems. During this study, we have synthesized a new p-cyano based bis-urea receptors from the reaction of 2,2'-Diamino-N-methyldiethylamine with p-cyano phenyl isocyanate in CH2Cl2. In the solid state, the bis-urea urea coordinates one halide through N-H���halide interactions. In solution, the host bind halides showing an order of I-<Br-<Cl-<<F-. In this poster, the detailed studies of this receptor for halides will be discussed. Acknowledgement:  The NSF is acknowledged for a CAREER award (CHE-1056927) to MAH.

Halide binding studies of a new p-cyano based dipodal bis-urea receptor: Highly selective towards fluoride ion

245th National Meeting (2013)

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