Tekuri Venkatadri, Trivedi Darshak R
Supramolecular Chemistry Laboratory, Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Mangalore, 575025, Karnataka, India.
Supramolecular Chemistry Laboratory, Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Mangalore, 575025, Karnataka, India.
Anal Chim Acta. 2017 Jun 15;972:81-93. doi: 10.1016/j.aca.2017.03.035. Epub 2017 Mar 27.
A new heterocyclic thiophene-2-caboxylic acid hydrazide based chemosensor R1 to R4 were designed, synthesized and characterized by various spectroscopic techniques like FT-IR, UV-Vis, H NMR, C NMR, Mass and SC-XRD. The chemosensor R3 showed a significant color change from colorless to yellow in the presence of Cu ions and chemosensor R4 showed a significant color change from colorless to yellow in the presence of Cd ions over the other tested cations such as Cr, Mn, Fe, Fe, Co, Ni, Zn, Ag, Al, Pb, Hg, K, Ca and Mg. The high selective and sensitivity of R3 towards Cu and R4 towards Cd ions was confirmed by UV-Vis spectroscopic study. The R3 showed a red shift in the presence of Cu ions by Δλ 67 nm and R4 showed a red shift in the presence of Cd ions by Δλ 105 nm in the absorption spectrum. The binding stoichiometric ratio of the complex between R3 - Cu and R4 - Cd ions have been found to be 1:1 using the B-H plot. Under optimized experimental conditions, the R3 and R4 exhibits a dynamic linear absorption response range, from 0 to 50 μM for Cu ions and 0 to 30 μM for Cd ions, with the detection limit of 2.8 × 10 M for Cu and 2.0 × 10 M for Cd ions. The proposed analytical method for the quantitative determination of Cu and Cd ions was validated and successfully applied for the environmental samples with good precision and accuracy.
设计、合成了一种基于新型杂环噻吩 - 2 - 羧酸酰肼的化学传感器R1至R4，并通过傅里叶变换红外光谱（FT - IR）、紫外 - 可见光谱（UV - Vis）、氢核磁共振（H NMR）、碳核磁共振（C NMR）、质谱和单晶X射线衍射（SC - XRD）等多种光谱技术对其进行了表征。在存在铜离子的情况下，化学传感器R3显示出从无色到黄色的显著颜色变化；在存在镉离子的情况下，化学传感器R4相对于其他测试阳离子（如铬、锰、铁、钴、镍、锌、银、铝、铅、汞、钾、钙和镁）也显示出从无色到黄色的显著颜色变化。紫外 - 可见光谱研究证实了R3对铜离子和R4对镉离子具有高选择性和高灵敏度。在吸收光谱中，R3在存在铜离子时出现了67 nm的红移，R4在存在镉离子时出现了105 nm的红移。使用B - H图发现R3 - Cu和R4 - Cd离子之间配合物的结合化学计量比为1:1。在优化的实验条件下，R3和R4对铜离子表现出0至50 μM、对镉离子表现出0至30 μM的动态线性吸收响应范围，铜离子的检测限为2.8×10⁻⁶ M，镉离子的检测限为2.0×10⁻⁶ M。所提出的定量测定铜离子和镉离子的分析方法经过验证，并成功应用于环境样品的检测，具有良好的精密度和准确度。
