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以纳米氧化铜为催化剂合成了克酮酸,将它与2,3,3-三甲基-3H-吲哚经缩合反应得到吲哚克酮酸染料(ICR),利用紫外-可见(UV-Vis)吸收光谱考察了其对Na+、K+、Mg2+、Ca2+、Ni2+、Mn2+、Zn2+、Ag+和Ba2+的阳离子识别作用。结果表明,当加入Ag+时,ICR的乙醇-水溶液〔V(C2H5OH)∶V(H2O)=4∶1〕吸光度降低,且溶液颜色由橄榄绿色变为橘黄色,而加入其他阳离子则无变化。研究了Ag+对ICR的乙醇-水溶液〔V(C2H5OH)∶V(H2O)=4∶1〕荧光发射光谱的影响,同样发现只有Ag+能使其荧光猝灭,显示了ICR对Ag+具有较高的选择性及灵敏性。此外,通过循环伏安法和1HNMR探究了该化合物对Ag+的识别作用机理。
Keto acid was synthesized with nano-copper oxide as catalyst and indomethacin dithiocarboxylate (ICR) was obtained through condensation reaction with 2,3,3-trimethyl-3H-indole. The UV- Vis) was used to investigate the cation recognition of Na +, K +, Mg2 +, Ca2 +, Ni2 +, Mn2 +, Zn2 +, Ag + and Ba2 +. The results showed that when Ag + was added, the absorbance of ICR in ethanol-water solution (V (C2H5OH): V (H2O) = 4: 1] decreased and the solution color changed from olive green to orange. The effect of Ag + on the fluorescence emission spectra of ICR in ethanol-water solution [V (C2H5OH): V (H2O) = 4:1] was also studied. It was also found that only Ag + could quench its fluorescence, indicating that ICR had a higher Selectivity and sensitivity. In addition, the mechanism of recognition of Ag + by this compound was explored by cyclic voltammetry and 1 HNMR.