The chemical sensing of hydrophilic anions such as F⁻ and OH⁻ is of significant importance but also presents considerable challenges. Herein, the thermal E to Z isomerization of a visible-light-responsive photoswitch (HTI-In) is utilized to address this challenge for the first time. The isomerization of HTI-In is dependent on the concentration of F⁻ and OH⁻, and exhibits excellent selectivity toward F⁻ and OH⁻ over other common anions and cations. Unlike irreversible chemodosimeters and other conventional fluorescent probes, the photodynamic sensing of F⁻ and OH⁻ (demonstrated in solvents and polyurethane hydrogels) is based on a non-equilibrium chemical kinetics and can be operated fully reversibly.

中文翻译：

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可见光光切换吲哚半硫靛的离子选择性响应：氟化物和氢氧化物的化学传感

^{F -}和 OH ^-等亲水阴离子的化学传感非常重要，但也提出了相当大的挑战。在此，首次利用可见光响应光电开关（HTI-In）的热E至Z异构化来解决这一挑战。 HTI-In 的异构化取决于 F ^-和 OH ^-的浓度，并且相对于其他常见阴离子和阳离子，对 F ^-和 OH ^-表现出优异的选择性。与不可逆化学剂量计和其他传统荧光探针不同，F ^-和 OH ^-的光动力传感（在溶剂和聚氨酯水凝胶中得到证实）基于非平衡化学动力学，并且可以完全可逆地操作。