Negi Swati, Gahlyan Parveen, Bawa Rashim, Singh Bholey, Bhandari Mamta, Kakkar Rita, Pani Balaram, Kumar Rakesh
Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, 110007, India.
Department of Chemistry, Shivaji College, University of Delhi, Delhi 110027, India.
Anal Methods. 2023 Aug 17;15(32):4000-4009. doi: 10.1039/d3ay00783a.
A new rhodamine based fluorescent and colorimetric chemosensor S1 was synthesized for the selective recognition of Cr, a trivalent metal ion. The interaction of S1 toward different metal ions has been studied fluorescence and UV-visible spectroscopy. The studies revealed that the fluorescence and colorimetric changes of chemosensor S1 are prominent for Cr over other competitive metal ions. Moreover, the chemosensor S1 exhibits 1 : 1 complex formation with Cr as apparent from the Job's plot and the Benesi-Hildebrand (B-H) plot. Density functional theory (DFT) studies also revealed that the Cr ion is coordinated to three atoms of S1, which validates the formation of a complex between S1 and Cr. The limit of detection (LOD) of chemosensor S1 for Cr was 0.21 μM. Furthermore, to explore the recyclability of S1, ethylenediaminetetraacetic acid (EDTA) was added to the S1-Cr3+ solution. On the addition of EDTA to the solution of S1-Cr3+, the reversibility of the complex was observed, and a colorimetric variation was also observed on the addition of Cr and EDTA to S1 which mimics the "INHIBIT "molecular logic gate. Chemosensor S1 also demonstrated practical utility through detection of Cr in the solid state.
合成了一种基于罗丹明的新型荧光和比色化学传感器S1，用于选择性识别三价金属离子Cr。通过荧光光谱和紫外可见光谱研究了S1与不同金属离子的相互作用。研究表明，化学传感器S1对Cr的荧光和比色变化比其他竞争性金属离子更为显著。此外，从Job曲线和Benesi-Hildebrand（B-H）曲线可以看出，化学传感器S1与Cr形成了1:1的配合物。密度泛函理论（DFT）研究还表明，Cr离子与S1的三个原子配位，这证实了S1与Cr之间形成了配合物。化学传感器S1对Cr的检测限为0.21μM。此外，为了探索S1的可回收性，向S1-Cr3+溶液中加入了乙二胺四乙酸（EDTA）。向S1-Cr3+溶液中加入EDTA后，观察到配合物的可逆性，并且向S1中加入Cr和EDTA时也观察到比色变化，这模拟了“抑制”分子逻辑门。化学传感器S1还通过检测固态Cr证明了其实用性。
