Abstract：
In this study, we report a new syringe aldehyde-derived hydrazinyl-imidazole based fluorescent sensor (L) for sensitive detection of different inorganic quenchers (halide ions, bicarbonate ion, sulphide ion and transition metal ions). The chromophore (L) was obtained in good yield by the 1:1 condensation reaction of 2-hydrazino-4,5-dihydroimidazole hydrobromide and 4-hydroxy-3,5-dimethoxy benzaldehyde. L exhibited strong fluorescence in the visible region (around 380 nm) and its interaction with different quenchers was studied in details via fluorescence technique. For the halide ions series, its sensitivity is higher for NaF (Climit = 4 × 10- 4 M) than for NaCl while the fluorescence quenching occurred mainly through a dynamic process. Similar considerations were observed for HCO3- and S2- quencher too, when static and dynamic quenching take place simultaneously. Regarding transition metal ions, at a fixed ion concentration (4 × 10- 6 M), best performance was achieved for Cu2+ and Fe2+ (fluorescence intensity was reduced by 79% and 84.9% respectively), while for other metal ions, the sensor performance was evaluated and found to be very less (< 40%). Thus, minimum detection limits (10- 6 - 10- 5 M range) recommended the use of such derivatives as highly sensitive sensors capable to monitor delicate changes in varied environments.
摘要：
在这项研究中,我们报告了一种新的注射器醛衍生的肼基咪唑基荧光传感器（L），用于灵敏检测不同的无机猝灭剂（卤化物离子，碳酸氢根离子,硫化物离子和过渡金属离子)。通过2-肼基-4,5-二氢咪唑氢溴酸盐和4-羟基-3,5-二甲氧基苯甲醛的1:1缩合反应以良好的产率获得发色团(L)。L在可见光区（约380nm）表现出强荧光，并通过荧光技术详细研究了其与不同猝灭剂的相互作用。对于卤化物离子系列，NaF（Climit=4×10-4M）的灵敏度高于NaCl，而荧光猝灭主要通过动态过程发生。对于HCO3-和S2-猝灭剂也观察到类似的考虑，当静态和动态淬火同时发生。关于过渡金属离子，在固定离子浓度(4×10-6M)下，Cu2+和Fe2+表现最好(荧光强度分别降低79%和84.9%),而对于其他金属离子，对传感器性能进行了评估，发现其性能非常低（<40％）。因此，最低检测限（10-6-10-5M范围）建议使用此类衍生物作为能够监测各种环境中细微变化的高灵敏度传感器。
