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Monitoring of reaction kinetics and determination of trace water in hydrophobic organic solvents by a smartphone-based ratiometric fluorescence device
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-09-12 , DOI: 10.1007/s00604-020-04551-w Zhe Li 1 , Xiaolan Chen 1 , Lei Yu 2 , Huijuan Li 3 , Lu Chen 1 , Qi Kang 1 , Dazhong Shen 1
Microchimica Acta ( IF 5.3 ) Pub Date : 2020-09-12 , DOI: 10.1007/s00604-020-04551-w Zhe Li 1 , Xiaolan Chen 1 , Lei Yu 2 , Huijuan Li 3 , Lu Chen 1 , Qi Kang 1 , Dazhong Shen 1
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A smartphone-based ratiometric fluorescence device was designed to monitor the reaction kinetic process under vigorous mixing conditions, demonstrated by the hydrolysis of Cs4PbBr6 nanocrystals (NCs). In the presence of trace water, part of Cs4PbBr6 NCs (non-fluorescent) was converted to CsPbBr3 NCs (strong fluorescent). Using anthracene as the reference fluorophore, the brightness ratio of the green (from CsPbBr3 NCs) to blue (from anthracene) components in the fluorescence image which was recorded in situ by the smartphone camera was measured as the signal for kinetic analysis. It was shown that the water-triggered conversion reaction from Cs4PbBr6 NCs to CsPbBr3 NCs follows the pseudo-second-order kinetic model in the early rapid hydrolysis stage (up to 4 min). With increasing water content, the hydrolysis of Cs4PbBr6 NCs is promoted to yield more CsPbBr3 NCs, which was used to determine trace water in n-hexane, dichloromethane, and toluene with detection limits of 0.031, 0.043, and 0.057 μL mL−1, respectively. The device offers the advantages of portability and low cost for rapid field determination of trace water in hydrophobic organic solvents. Graphical abstract Graphical abstract
中文翻译：
通过基于智能手机的比率荧光装置监测反应动力学并测定疏水性有机溶剂中的痕量水
设计了一种基于智能手机的比率荧光装置来监测剧烈混合条件下的反应动力学过程，Cs4PbBr6 纳米晶体 (NCs) 的水解证明了这一点。在微量水存在下，部分 Cs4PbBr6 NCs（非荧光）被转化为 CsPbBr3 NCs（强荧光）。使用蒽作为参考荧光团，测量由智能手机相机原位记录的荧光图像中绿色（来自 CsPbBr3 NCs）与蓝色（来自蒽）组分的亮度比作为动力学分析的信号。结果表明，水引发的从 Cs4PbBr6 NCs 到 CsPbBr3 NCs 的转化反应在早期快速水解阶段（最多 4 分钟）遵循伪二级动力学模型。随着含水量的增加，促进 Cs4PbBr6 NCs 的水解产生更多 CsPbBr3 NCs，用于测定正己烷、二氯甲烷和甲苯中的痕量水，检测限分别为 0.031、0.043 和 0.057 μL mL-1。该设备具有便携性和低成本的优点，可用于快速现场测定疏水性有机溶剂中的痕量水。图形摘要图形摘要
更新日期：2020-09-12
中文翻译：
通过基于智能手机的比率荧光装置监测反应动力学并测定疏水性有机溶剂中的痕量水
设计了一种基于智能手机的比率荧光装置来监测剧烈混合条件下的反应动力学过程，Cs4PbBr6 纳米晶体 (NCs) 的水解证明了这一点。在微量水存在下，部分 Cs4PbBr6 NCs（非荧光）被转化为 CsPbBr3 NCs（强荧光）。使用蒽作为参考荧光团，测量由智能手机相机原位记录的荧光图像中绿色（来自 CsPbBr3 NCs）与蓝色（来自蒽）组分的亮度比作为动力学分析的信号。结果表明，水引发的从 Cs4PbBr6 NCs 到 CsPbBr3 NCs 的转化反应在早期快速水解阶段（最多 4 分钟）遵循伪二级动力学模型。随着含水量的增加，促进 Cs4PbBr6 NCs 的水解产生更多 CsPbBr3 NCs，用于测定正己烷、二氯甲烷和甲苯中的痕量水，检测限分别为 0.031、0.043 和 0.057 μL mL-1。该设备具有便携性和低成本的优点，可用于快速现场测定疏水性有机溶剂中的痕量水。图形摘要图形摘要
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