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Hydrolysis of 2-Chloro-2-methylpropane—Demonstration Using the Quenching of Fluorescence from Fluorescein
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2021-01-25 , DOI: 10.1021/acs.jchemed.0c01255 Masatada Matsuoka 1 , Takashiro Akitsu 2
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2021-01-25 , DOI: 10.1021/acs.jchemed.0c01255 Masatada Matsuoka 1 , Takashiro Akitsu 2
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2-Chloro-2-methylpropane slowly hydrolyzes in water, releasing hydrochloric acid. Therefore, the addition of 2-chloro-2-methylpropane to an aqueous solution of sodium hydroxide containing an acid–base indicator causes a color change when the solution becomes acidic. Here we report the use of fluorescein, a fluorescent dye, as an indicator for the completion of the above-mentioned reaction. Under blacklight radiation, completion of the reaction is marked by the disappearance of fluorescence. Compared with the other clock reactions, this fluorescent reaction is more advantageous because it requires inexpensive reagents and involves milder conditions, and it is expected to be utilized in chemistry outreach events. Furthermore, the demonstration can be easily understood by high school students since the reaction mechanism can be explained well by changing the pH, and it is suitable for practice in the classroom.
中文翻译：
2-氯-2-甲基丙烷的水解—荧光素荧光猝灭的演示
2-氯-2-甲基丙烷在水中缓慢水解，释放出盐酸。因此，在含有酸碱指示剂的氢氧化钠水溶液中添加2-氯-2-甲基丙烷会导致溶液变酸，从而引起颜色变化。在这里，我们报道了使用荧光素（一种荧光染料）作为完成上述反应的指示剂。在黑光辐射下，荧光的消失标志着反应的完成。与其他时钟反应相比，该荧光反应更具优势，因为它需要廉价的试剂并且涉及较温和的条件，并且有望在化学外联事件中使用。此外，
更新日期：2021-03-09
中文翻译：
2-氯-2-甲基丙烷的水解—荧光素荧光猝灭的演示
2-氯-2-甲基丙烷在水中缓慢水解，释放出盐酸。因此，在含有酸碱指示剂的氢氧化钠水溶液中添加2-氯-2-甲基丙烷会导致溶液变酸，从而引起颜色变化。在这里，我们报道了使用荧光素（一种荧光染料）作为完成上述反应的指示剂。在黑光辐射下，荧光的消失标志着反应的完成。与其他时钟反应相比，该荧光反应更具优势，因为它需要廉价的试剂并且涉及较温和的条件，并且有望在化学外联事件中使用。此外，
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