A Versatile Colorimetric Chemosensor for Anion Detection with Phosphonium Derivative

In a wide range of environmental, clinical, chemical, and biological applications, anion recognition in supramolecular chemistry is important role. The design of host molecules that are able to selectively recognize and sense anion species has to do considerable attention. Color changes can be detected by the naked eye. So it is widely used as signals for events owing to the inexpensive equipment required or no equipment at all. In viewing of biological importance, excessive fluoride anion may cause hair loss, skin inflammation, osteoporosis and mutation of especially children’s teeth enamel. Even though some receptor compounds for fluoride ions have been reported, there is a paucity of reports on selective naked eye chemosensors for fluoride. Nitrophenyl and nitronaphthalene urea, as a signal unit for fluoride, have been reported as chromogenic chemosensors, As we mentioned previous papers, only few phosphonium salt receptor was developed although importance of anion receptor. We reported here a further developed novel phosphonium derivative of naphthalene for anion sensors. In pursuit to develop a sensitive and versatile anion chemosensor, a naphthalene tetrakis phosphonium derivative 6 was synthesized, and its anion binding properties were investigated by H NMR, UV-vis spectroscopy, color changes and X-ray structural analysis.