A ratiometric fluorescent probe for bisulphite anion, employing intramolecular charge transfer.
4-(1H-benzimidazol-2-yl)benzaldehyde (1) has been developed as a new ratiometric fluorescent probe for bisulphite, based on the modulation of intramolecular charge transfer (ICT). Upon mixing with bisulphite in aqueous ethanol, an aldehyde-bisulphite adduct was formed and the ICT of the probe was switched off, which resulted in a ratiometric fluorescence response with an enhancement of the ratios of emission intensities at 368 and 498 nm. The detection range of the probe for bisulphite is in the 2.0-200 µmol/L concentration range and the detection limit is 0.4 µmol/L. Probe 1 produces a ratiometric fluorescent response to bisulphite with a marked emission wavelength shift (130 nm) and displays high selectivity for bisulphite over other anions.
Department of Chemistry, Northwest University, Xi'an, People's Republic of China.
Gang
G
Wang
Haiping
H
Qi
Xiao-Feng
XF
Yang
D000838:Anions / Q000737:chemistry*; D001547:Benzaldehydes / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods*; D015394:Molecular Structure; D013447:Sulfites / Q000737:chemistry*
D000838:Anions; D001547:Benzaldehydes; D005456:Fluorescent Dyes; D013447:Sulfites; C042345:hydrogen sulfite; C032175:benzaldehyde