Selective sensing of Fe3+ based on fluorescence quenching by 2,6-bis(benzoxazolyl)pyridine with β-cyclodextrin in neutral aqueous solution

A selective and sensitive fluorescent chemosensor (BBOZP-CD) for Fe3+ was composed of water-soluble β-cyclodextrins and 2,6-bis(benzoxazolyl)pyridine which was synthesized through the reaction of 2,6-pyridinedicarboxylic acid and o-aminophenol catalyzed by polyphosphoric acid under microwave irradiation. The chemosensor BBOZP-CD for metal ions were carefully investigated by fluorescent quenching in present of metal ions. The result showed BBOZP-CD chemosensor was remarkable fluorescence quenching and a highly selectivity and sensitivity for Fe3+ in neutral aqueous solution, and the other common metal ions did not notably disturb the detection of Fe3+. Additionally, the effect of pH to the chemosensor for Fe3+ was also studied. The result indicated the respond signals of BBOZP-CD to Fe3+ was stable and hardly influenced while the pH value was greater than 3.6.