Convenient synthesis and anion recognition property of acylhydrazone-based molecular tweezer receptors
نویسندگان
چکیده
Three acylhydrazone-based compounds were designed as novel neutral sensors for anions, and synthesized by simple steps in good yields. Their anion recognition properties were studied by UV-vis and H-NMR spectroscopy. The results showed that the receptors 1, 2, and 3 all had a better selectivity for F− and CH3COO − , but no evident binding with Cl− , Br− , I− , NO3 , H2PO − 4 , or HSO − 4 . The results indicated that anion recognition was achieved via convergent hydrogen bond interactions from acylhydrazone functionality on the side arms. The UV-vis data indicated that a 1:1 stoichiometry complex was formed between compounds 1, 2, or 3 and anions. The binding and selectivity were also tuned by the change of the place of the nitro group attached to the phenyl. Moreover, receptor 3 can act as the colorimetric sensor for such anions as F− and CH3COO − , and the recognition mechanism and binding mode were discussed.
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