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以氯化铕、2-噻吩甲酰三氟丙酮(HTTA)和硅酸钠为原料制备了新型的检测二氯甲烷中乙醇含量的稀土配合物。通过在溶有所制备的稀土配合物的二氯甲烷溶液中滴加无水乙醇,发现溶液的荧光强度逐渐增强,而且具备一定的规律性。所制备的新型稀土配合物通过高分辨质谱分析表明,其结构属于多核稀土配合物。在二氯甲烷溶液中加入乙醇会改变溶液的极性,使多核稀土配合物发生解离从而增强荧光强度。这种稀土配合物可以作为荧光传感器检测有机溶剂中乙醇的含量。
A novel rare earth complex for the determination of ethanol content in dichloromethane was prepared from europium chloride, 2-thienoyl trifluoroacetone (HTTA) and sodium silicate. By adding anhydrous ethanol to the solution of rare earth complex dissolved in dichloromethane, the fluorescence intensity of the solution was gradually increased and the regularity was found. The novel rare earth complexes prepared by high-resolution mass spectrometry analysis showed that the structure belongs to the multi-core rare earth complexes. Addition of ethanol in methylene chloride solution changes the polarity of the solution, dissociating the multinuclear rare earth complex and enhancing the fluorescence intensity. This rare earth complex can be used as a fluorescence sensor to detect the content of ethanol in organic solvents.