Department of Chemistry, School of Advanced Sciences , Vellore Institute of Technology , Vellore 632014 , Tamil Nadu , India.
Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute , Kalpakkam 603102 , Tamil Nadu , India.
Inorg Chem. 2018 Dec 17;57(24):15270-15279. doi: 10.1021/acs.inorgchem.8b02564. Epub 2018 Dec 5.
In this paper, a new Th ion-selective chromogenic sensor (L) was developed by reacting 1,10-phenanthroline-2,9-dicarbohydrazide with 2-hydroxy naphthaldehyde. The sensing ability of L toward Th was investigated in solution and paper strips loaded with L using spectrophotometric and colorimetric methods. The selective interaction of L was examined with various f-metal ions and other selected metal ions from s-block and d-block elements. Results show that by the colorimetric method in solution-phase dimethyl sulfoxide/HO (7:3, v/v) and paper strip methods, the naked-eye detectable color change of L occurred from colorless solution to yellow-orange and pale yellow colour upon interacting with Th and Al, respectively, whereas other metal ions did not interfere. The ligand L exhibits two absorbance bands at 320 and 375 nm because of ligand-to-ligand charge transfer. Upon interaction with Th, L undergoes red shift of both absorption bands and the formation of a new UV-vis band at 335 and 440 nm. The UV-visible spectral studies indicate the formation of a 1:1 host-guest complex between L and Th with an association constant of 4.7 × 10 M. The limit of quantification and limit of detection of L for the analysis of Th are found to be 167 and 50 nM, respectively. The visually detectable color change of L has been well integrated with a smartphone RGB color value to make it an analytical signal for real-time analysis of Th with the detection limit down to 116 nM. Besides, L was applied for the analysis of Th content present in various real water samples, monazite, and lantern mantle samples by spectrophotometry and RGB color values. The binding mode of L with Th is investigated by H NMR, electrospray ionization-mass, and theoretical studies.
在本文中，通过将 1,10-菲咯啉-2,9-二羧酸二酰肼与 2-羟基萘醛反应，开发了一种新的 Th 离子选择性显色传感器（L）。使用分光光度法和比色法在溶液中和负载有 L 的纸条上研究了 L 对 Th 的传感能力。研究了 L 与各种 f 金属离子以及来自 s 块和 d 块元素的其他选定金属离子的选择性相互作用。结果表明，通过在溶液相二甲基亚砜/HO（7:3，v/v）和纸条方法中的比色法，L 与 Th 和 Al 相互作用时，从无色溶液到黄色橙色和淡黄色的肉眼可检测颜色变化，而其他金属离子则没有干扰。配体 L 由于配体到配体的电荷转移而具有两个吸收带，在 320nm 和 375nm 处。与 Th 相互作用时，L 的两个吸收带均发生红移，并且在 335nm 和 440nm 处形成新的紫外可见带。紫外可见光谱研究表明，L 与 Th 之间形成了 1:1 的主体-客体络合物，其缔合常数为 4.7×10^M。L 用于 Th 分析的定量下限和检测限分别为 167nm 和 50nm。L 的可见颜色变化已与智能手机 RGB 颜色值很好地集成在一起，使其成为实时分析 Th 的分析信号，检测限低至 116nm。此外，L 还通过分光光度法和 RGB 颜色值用于分析各种实际水样、独居石和灯笼罩样品中的 Th 含量。通过 H NMR、电喷雾电离质谱和理论研究研究了 L 与 Th 的结合模式。
