Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India.
Department of Chemistry, College of Science, King Saud University, Pin Code-2455, Riyadh 11451, Saudi Arabia.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Feb 15;247:119156. doi: 10.1016/j.saa.2020.119156. Epub 2020 Nov 4.
A diaminobenzophenone Schiff base derived probe 1, was synthesized and structure elucidation was carried out by spectroscopic studies viz., FT-IR, UV-vis, H, and C NMR and mass spectrometry. The sensing phenomenon with different metal ions (Cr, Mn, Fe, Fe, Co, Ni, Cu, Zn, Cd) was investigated by employing absorption and fluorescence titrations, which demonstrated that probe 1 exhibited selective fluorescent sensing behavior towards Fe ion among various other metal ions. The porobes selceteclivity towards Fe was also examined by colorimetric assay which revealed a change in the color from light yellow to brown upon addition of Fe ion. A remarkable increase in the fluorescence intensity of probe 1 was observed towards Fe ion, which was found to be associated with the inhibition of photoinduced electron-transfer (PET) and CN isomerization processes, respectively. The chemosensor exhibited an association constant value of 6.173 × 10 M as determined by using non-linear least square fit data. Job's plot calculated the binding stoichiometry, and the sensing phenomenon of Fe towards the probe was further supported by Density Functional Theory (DFT) calculations and H NMR studies. The detection limit of probe 1 was found to be 0.0363 µM, which is below the permissible limits according to the WHO guideline (5 μM) for Fe ions in the drinking water. Furthermore, the practical application of probe 1 was studied by analyzing the content of Fe in different water samples.
一种二氨基二苯甲酮席夫碱探针 1 通过光谱研究（FT-IR、UV-vis、H 和 C NMR 以及质谱）进行了合成和结构阐明。通过吸收和荧光滴定研究了与不同金属离子（Cr、Mn、Fe、Fe、Co、Ni、Cu、Zn、Cd）的传感现象，结果表明探针 1 对各种金属离子中的 Fe 离子表现出选择性荧光传感行为。探针 1 对 Fe 的选择性也通过比色测定法进行了检查，结果表明，当加入 Fe 离子时，颜色从浅黄色变为棕色。对 Fe 离子的探针 1 的荧光强度有显著增加，这被发现与光诱导电子转移（PET）和 CN 异构化过程的抑制分别相关。通过使用非线性最小二乘拟合数据确定了化学传感器的结合常数值为 6.173×10 M。通过 Job 图计算了结合化学计量，并且通过密度泛函理论（DFT）计算和 H NMR 研究进一步支持了 Fe 对探针的传感现象。探针 1 的检测限为 0.0363 µM，低于世界卫生组织（WHO）饮用水中 Fe 离子的允许限量（5 µM）。此外，通过分析不同水样中的 Fe 含量研究了探针 1 的实际应用。
