The binding and sensing abilities of pyrimidine based fluorescence chemosensor L towards different anions such as F^-, Cl^-, Br^-, I^-, NO₃^-, ClO₄^-, H₂PO₄^- and HSO₄^- have been examined by fluorescence spectroscopy in DMSO-H₂O (7: 3, v/v). Upon successive addition of various anions to DMSO-H₂O solutions of L; quenching in emission fluorescence is observed at 480 nm. Analysis of fluorescence emission changes suggested the formation of 1:1 complex of L with the anions. From the fluorescence binding constant data, it is found that L form strong complexes with F^- and HSO₄^- ions through H-bonding interactions. The selective response of F^- over other halides and HSO₄^- amongst other oxo-anions towards L may be explained on the basis of photo-induced electron transfer process.

中文翻译：

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基于嘧啶的荧光化学传感器选择性检测氟和硫酸氢根阴离子

基于嘧啶荧光化学传感器的结合和感测能力大号朝向不同的阴离子，如F ^- ，氯^- ，溴^- ，我^-，NO ₃ ^-，CLO ₄ ^-，H ₂ PO ₄ ^-和HSO ₄ ^-已经研究了荧光DMSO-H ₂ O（7：3，v / v）中的光谱。在向L的DMSO-H ₂ O溶液中连续添加各种阴离子后；在480nm处观察到发射荧光的猝灭。荧光发射变化的分析表明形成了1：1络合物L与阴离子。从荧光结合常数数据，发现大号型强配合物有F ^-和HSO ₄ ^-的离子通过氢键相互作用。F的选择性响应^-比其它卤化物和HSO ₄ ^-之中朝向其他含氧阴离子大号可光诱导的电子转移过程的基础上进行说明。