摘要/Abstract

设计并合成一种具有席夫碱结构的新型荧光增强型探针7-（二丁基氨基）-2'-[（2-羟基苯亚甲基）氨基]-3-甲基-1-苯基-1H-螺[色烯并[2，3-c]吡唑-4，1'-异吲哚啉]-3'-酮（SCPz-S），通过¹H NMR、¹³C NMR及高分辨质谱（HRMS）对其结构进行了表征.利用紫外-可见光谱和荧光光谱考察探针SCPz-S的离子识别性能，研究发现探针SCPz-S在THF/H₂O（V：V=1930：50，5 mmol/L Tris-HCl，pH=7.4）中对CN^-具有比色和荧光上的双重响应.加入CN^-后，探针SCPz-S的体系会由无色变为淡黄色，在575 nm荧光增强1060倍.探针SCPz-S拥有良好的抗干扰能力和很广的pH适用范围（pH=3~12）.探针对CN^-的检出限达到1.121×10^-8 mol/L，并对其识别机理进行了研究.
关键词: 螺[色烯并[2,3-c]吡唑-4,1'-异吲哚啉], 荧光, 比色, CN^-, 席夫碱, 去质子化
A novel fluorescent "turn-on" probe 7-(dibutylamino)-2'-((2-hydroxybenzylidene)amino)-3-methyl-1-phenyl-1H-spiro[chromeno[2,3-c]pyrazole-4,1'-isoindolin]-3'-one (SCPz-S) with Schiff base structure was designed and synthesized, and characterized by ¹H NMR, ¹³C NMR and high resolution mass spectrometry (HRMS). The UV-Vis and fluorescence spectra were used to investigate the ions recognition capability of probe SCPz-S. It was excavated that the probe SCPz-S has a dual colorimetric and fluorescence response to CN^- in THF/H₂O (V:V=1930:50, 5 mmol/L Tris-HCl, pH=7.4). After adding CN^-, the system of probe SCPz-S will change from colorless to yellow, and fluorescence enhance 1060-fold at 575 nm. The sensor SCPz-S also has good anti-interference ability and a wide pH range from 3 to 12 applicable. Its LOD for CN^- is 1.121×10^-8 mol/L, and the recognition mechanism has been investigated.
Key words: spiro[chromene[2,3-c]pyrazole-4,1'-isoindoline], fluorescence, colorimetric, CN^-, Schiff base, deprotonation


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