A diaminobenzophenone Schiff base derived probe 1, was synthesized and structure elucidation was carried out by spectroscopic studies viz., FT–IR, UV–vis, ¹H, and ¹³C NMR and mass spectrometry. The sensing phenomenon with different metal ions (Cr³⁺, Mn²⁺, Fe²⁺, Fe³⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺, Cd²⁺) was investigated by employing absorption and fluorescence titrations, which demonstrated that probe 1 exhibited selective fluorescent sensing behavior towards Fe²⁺ ion among various other metal ions. The porobes selceteclivity towards Fe²⁺ was also examined by colorimetric assay which revealed a change in the color from light yellow to brown upon addition of Fe²⁺ ion. A remarkable increase in the fluorescence intensity of probe 1 was observed towards Fe²⁺ 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 × 10⁷ M⁻² as determined by using non–linear least square fit data. Job’s plot calculated the binding stoichiometry, and the sensing phenomenon of Fe²⁺ towards the probe was further supported by Density Functional Theory (DFT) calculations and ¹H 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 Fe²⁺ ions in the drinking water. Furthermore, the practical application of probe 1 was studied by analyzing the content of Fe²⁺ in different water samples.

合成了二氨基二苯甲酮Schiff碱衍生的探针1，并通过光谱研究，即FT-IR，UV-vis，¹ H和¹³ C NMR和质谱法进行了结构解析。通过吸收法研究了不同金属离子（Cr ³⁺，Mn 2 ⁺，Fe 2 ⁺，Fe ³⁺，Co 2 ⁺，Ni 2 ⁺，Cu 2 ⁺，Zn 2 ⁺，Cd ²⁺）的感测现象。荧光滴定，表明探针1对Fe ²⁺表现出选择性的荧光传感行为离子以及其他各种金属离子。还通过比色测定法检查了对Fe ²⁺的极化选择性，该比色测定显示添加Fe ²⁺离子后颜色从浅黄色变为棕色。观察到探针1对Fe ²⁺离子的荧光强度显着增加，这分别与抑制光致电子转移（PET）和C N异构化过程有关。化学传感器表现出的关联常数值为6.173×10 ⁷ M ^-2，这是通过使用非线性最小二乘拟合数据确定的。Job's plot计算结合化学计量，以及Fe ²⁺的感测现象 密度泛函理论（DFT）计算和¹ H NMR研究进一步支持了对探针的 研究。探针1的检出限为0.0363 µM，低于世界卫生组织关于饮用水中Fe ²⁺离子的指导原则（5μM）的允许限值。此外，通过分析不同水样中Fe ²⁺的含量，研究了探针1的实际应用。