5418-67-7Relevant academic research and scientific papers
Dual spectroscopic responses of pyridinium hemicyanine dyes to anions
Xie, Puhui,Guo, Fengqi,Zhang, Dasheng,Zhang, Lei
experimental part, p. 1975 - 1981 (2012/07/14)
The absorption and fluorescence spectroscopic responses of three pyridinium hemicyanine dyes to anions F-, Cl-, Br-, I-, H2PO4-, HSO4 - and OAc- were investigated. At lower concentrations of OAc- (less than 1 equiv.), both the absorption and the fluorescence intensities of 1-3 were more effectively changed than F- at identical concentrations. At higher concentrations of OAc- (more than 1 equiv.), the interaction was opposite for each compound. 1H NMR results indicated the interaction between 1, 2 or 3 and F- proceeded through hydrogen bonding. The results showed that these dyes are promising to develop dual fluorescence and chromogenic chemosensors toward F- and OAc- according to the subtle difference in the affinity of F - and OAc-. Pyridinium hemicyanine dyes bearing hydroxyl groups on the benzene ring provide a simple class of anion receptors which are capable of selectively reporting the presence of F- and OAc - in CH3CN by color changes. Copyright
