Takkar Priya, Negi Swati, Kakkar Rita, Kumar Rakesh
Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
Computational Chemistry Group, Department of Chemistry, University of Delhi Delhi-110007 India.
RSC Adv. 2025 Jan 17;15(3):1641-1657. doi: 10.1039/d4ra08258c. eCollection 2025 Jan 16.
This work presents the development of a rhodamine-based colorimetric and turn-on fluorescent chemosensor (P1) designed for selective recognition of Ni ions. Chemosensor P1 exhibited remarkable sensitivity and selectivity for Ni ions, exhibiting clear colorimetric and fluorescence responses. The binding interactions were meticulously examined using UV-Vis. and fluorescence spectroscopy, demonstrating a 1 : 1 stoichiometric ratio between P1 and Ni ions a Job's plot and Benesi-Hildebrand analysis, while the binding constant and limit of detection were established as 0.8919 × 10 M, and 2.15 nM, respectively. Interference studies demonstrated that competing metal ions had a minimal effect on the selectivity of the sensor. Chemosensor P1 showed practical applicability by fabricating paper strips and solid-state silica gel systems, facilitating the rapid and visible detection of Ni ions. Their stability and effectiveness were confirmed under a wide range of pH conditions. A molecular INHIBIT logic gate was created utilizing Ni and EDTA as inputs in conjunction with memory devices featuring a "write-read-erase-read" binary logic function, highlighting P1's capabilities in logic-based sensing and data storage. Furthermore, P1 demonstrated reversible binding to Ni in the presence of EDTA, enhancing its versatility. Density Functional Theory (DFT) calculations offered valuable insights into the molecular interactions, while the analysis of actual juice samples confirmed the efficacy of P1 for detecting Ni in complex matrices, making it an exceptional candidate for advanced environmental and analytical sensing technologies with outstanding selectivity and versatility.
这项工作展示了一种基于罗丹明的比色和开启型荧光化学传感器（P1）的开发，该传感器设计用于选择性识别镍离子。化学传感器P1对镍离子表现出显著的灵敏度和选择性，呈现出清晰的比色和荧光响应。使用紫外可见光谱和荧光光谱对结合相互作用进行了细致研究，通过Job曲线和Benesi-Hildebrand分析表明P1与镍离子的化学计量比为1∶1，同时结合常数和检测限分别确定为0.8919×10 M和2.15 nM。干扰研究表明，竞争性金属离子对传感器的选择性影响极小。通过制作纸条和固态硅胶系统，化学传感器P1显示出实际应用价值，便于快速、直观地检测镍离子。在广泛的pH条件下证实了它们的稳定性和有效性。利用镍和乙二胺四乙酸作为输入，结合具有“写-读-擦除-读”二进制逻辑功能的存储器件，创建了一个分子抑制逻辑门，突出了P1在基于逻辑的传感和数据存储方面的能力。此外，P1在乙二胺四乙酸存在下对镍表现出可逆结合，增强了其通用性。密度泛函理论（DFT）计算为分子相互作用提供了有价值的见解，而实际果汁样品分析证实了P1在复杂基质中检测镍的有效性，使其成为具有出色选择性和通用性的先进环境和分析传感技术的优秀候选者。
