2,4-dinitrophenylhydrazine and 1,10-phenanthroline Conjugated Colorometric Receptor for Selective Sensing of F-

A new chromogenic sensor, 1,10-phenanthroline affixed to the 2,4-dinitrophenylhydrazine moiety, was synthesized and characterized. Among anions added into it, F-, AcO- and H2PO4- ions resulted in the color changes from light brown to dark brown, while other tested anions did not induce color changes. Meanwhile, the anion-binding ability has been investigated by UV-vis and 1H NMR titrations in DMSO-d6. The sensor displays an even stronger binding to F- over AcO- and H2PO4- ions with 1:1 stoichiometry through hydrogen bonding.