Abstract
A novel siloxane-aurone compound, 4′-cyano-4-tert-butyldiphenylsiloxane-aurone (named as TBDCN), was synthesized. The compound exhibits high sensitivity, fast response rate and high selectivity for fluoride anions recognition with obvious absorption and fluorescence response in aqueous solution, which is more sensitive than the traditionally type of chemodosimeters based on F−-triggered cleavage. The detection limits of TBDCN for F− are determined to be 1.9μM and 0.0017μM with absorption and fluorescence as detected signal, respectively, which satisfy the requirement from U.S. Environmental Protection Agency. The recognition mechanism is the F−-promoted dissociation of silicon-oxygen bond based on in situ mass spectra and 1H NMR spectra analysis.
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