Roy Debashis, Chakraborty Arijit, Ghosh Rina
Department of Chemistry, Jadavpur University, Kolkata 700032, India.
Department of Chemistry, Acharya B. N. Seal College, Cooch Behar, West Bengal 736101, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Feb 15;191:69-78. doi: 10.1016/j.saa.2017.09.071. Epub 2017 Sep 28.
(E)-4-Chloro-3-[{2-(4-nitrophenyl)hydrazono}methyl]-2H-chromen-2-one (C), a coumarin derivative has been studied toward its ion sensing properties for F, CN and Cu. A proton-transfer mechanism for F sensing has been deduced with the help of H NMR titration alongwith from the changes in the absorption and emission spectra of C in the presence of F. C formed 1:1 stoichiometric complex with each of these analytes. Sensing of C toward Cu is poor, but interestingly in the presence of For CN the sensing ability of Cu gets enhanced many folds, and C can act as For CN mediated off-on sensor for Cu. Moreover, colorimetric strip (pre-coated with the coumarin derived compound) tests for Fand CN from their DMSO solution at high temperature (100°C) opens up the door for easiest naked eye recognition and distinction of these ions, and also for naked-eye detection of F and CN from its aqueous solution at high temperature (100°C).
（E）-4-氯-3-[{2-（4-硝基苯基）肼基}甲基]-2H-色烯-2-酮（C），一种香豆素衍生物，已针对其对氟离子、氰根离子和铜离子的离子传感特性进行了研究。借助氢核磁共振滴定以及在氟离子存在下C的吸收光谱和发射光谱的变化，推导了氟离子传感的质子转移机制。C与这些分析物中的每一种都形成了1:1化学计量比的配合物。C对铜离子的传感性能较差，但有趣的是，在氟离子或氰根离子存在的情况下，C对铜离子的传感能力会增强许多倍，并且C可以作为氟离子或氰根离子介导的铜离子开-关传感器。此外，在高温（约100°C）下对二甲基亚砜溶液中的氟离子和氰根离子进行比色条（预涂有香豆素衍生化合物）测试，为这些离子的最简单肉眼识别和区分以及在高温（约100°C）下从其水溶液中肉眼检测氟离子和氰根离子打开了大门。
