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A highly selective and sensitive fluorescence 'turn-on' fluoride ion sensor

机译：高度选择性和灵敏的荧光“开启”氟离子传感器

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摘要

A colorimetric and turn-on fluorescent sensor for fluoride ions, based on 2-hydroxy-1-naphthalene formaldehyde bis-Schiff base, was readily synthesized. The sensor in DMSO exhibits high sensitivity and good selectivity for fluoride ions from aqueous media. The F--response mechanism involves a hydrogen bonding and deprotonation process in the sensor, which induced color changes from pale yellow to deep yellow and prominent fluorescence enhancement. The response time of sensor S for fluoride ions reached the plateau region after less than 1 s. Test strips based on sensor S were prepared, the test strips could conveniently detect fluoride ions in solutions. The detection limit was determined to be 1.4 x 10(-8) mol L-1 (2.66 x 10(-4) ppm), which is far lower than the WHO guideline for drinking water at levels of about (5.3-7.9) x 10(-3) mol L-1 (100.7-150.1) ppm. Thus the sensor can be used to detect fluoride ions in drinking water.
机译：可以轻松合成基于2-羟基-1-萘甲醛双席夫碱的比色法和开式荧光传感器。 DMSO中的传感器对来自水性介质的氟离子具有高灵敏度和良好的选择性。 F响应机制涉及传感器中的氢键和去质子过程，该过程导致颜色从浅黄色变为深黄色并显着增强荧光。传感器S对氟离子的响应时间在不到1 s的时间内达到平稳区域。制备了基于传感器S的测试条，该测试条可以方便地检测溶液中的氟离子。确定的检出限为1.4 x 10（-8）mol L-1（2.66 x 10（-4）ppm），远低于WHO饮用水准则（5.3-7.9）x 10（-3）mol L-1（100.7-150.1）ppm。因此，该传感器可用于检测饮用水中的氟离子。

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