Diphenoxymethane (1a and 1b) and biphenol derivatives (1c and 1d) bearing urea groups were prepared to be used in anion recognition. Diphenoxymethane derivative (1a) selectively bound chloride anion (Cl-) in 1:1 complexes. However, biphenol derivatives (1c and 1d) did not show a clear selectivity in anion recognition. The association constants of the complexes were determined by 1H-NMR titrations in CDCl3.
Keywords: Anion receptor, urea, biphenol, diphenoxymethane, chloride anion selectivity
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