Abstract

A naphthoquinone-functionalized hybrid organic-inorganic silica-based fluorescent sensor was designed, synthesized and characterized by X-ray diffraction, N₂ adsorption-desorption, thermogravimetric and infrared spectroscopy analysis. Fluorescence properties of the prepared sensor were investigated in the presence of different anions under excitation at 305 nm. The fluorescence emission of the sensor was remarkably quenched after addition of Cr₂\({\text{O}}_{7}^{{2 - }}\). Selectivity of the sensor was studied in the presence of common competing metal ions. The obtained results revealed that the sensor had high selectivity toward Cr₂\({\text{O}}_{7}^{{2 - }}\) anion. The linear relationship between the concentration of target anion and the fluorescence intensity was proved by performing a titration experiment. Finally, the detection limit was calculated as 6 × 10^–6 M, which demonstrates high sensitivity of the sensor toward Cr₂\({\text{O}}_{7}^{{2 - }}\).

中文翻译：

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萘醌官能化的纳米多孔二氧化硅：二氯甲酸酯的荧光合成，表征及应用

摘要

通过X射线衍射，N ₂吸附-解吸，热重分析和红外光谱分析，设计并合成了萘醌功能化的有机-无机杂化混合荧光传感器。在存在不同阴离子的情况下，在305 nm的激发下研究了所制备传感器的荧光特性。加入Cr ₂ \（{\ text {O}} _ {7} ^ {{2-}} \）后，传感器的荧光发射显着淬灭。在常见的竞争性金属离子存在下研究了传感器的选择性。获得的结果表明，该传感器对Cr ₂具有很高的选择性\（{\ text {O}} _ {7} ^ {{2-}} \）阴离子。通过进行滴定实验证明了目标阴离子浓度与荧光强度之间的线性关系。最后，计算出的检测极限为6×10 ^-6 M，这表明传感器对Cr ₂ \（{\ text {O}} _ {7} ^ {{2-}} \\}具有很高的灵敏度。