Smartphone-assisted colorimetric detection of nickel(ii) ions using a novel benzothiazole–quinoline dyad in semi-aqueous media†

IF 2.7 3区 化学 Q2 CHEMISTRY, ANALYTICAL
Suman Joseph, Pranati Somkuwar, Gayathri G. Menon, Anjana C. Rajesh, Pravinkumar Selvam, Selva Kumar Ramasamy, R. Bhaskar and S. K. Ashok Kumar
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Abstract

In this study, we present three different approaches for the colorimetric detection of Ni2+ ions using a specifically designed benzothiazole–quinoline dyad (L) synthesized via the Knoevenagel condensation reaction in high yield. The unique properties of L enable a rapid and selective response to Ni2+ ions, making it an ideal probe for practical applications. The probe L shows a pale yellow color under normal conditions. Upon interaction with Ni2+ ions, L undergoes a significant color change from pale yellow to bright orange, allowing for visual detection in semi-aqueous media. This rapid colorimetric response enables real-time monitoring of Ni2+ concentrations. The absorption maximum of L undergoes a bathochromic shift in the presence of Ni2+ ions due to ligand-to-metal charge transfer (LMCT). The probe L could form a 2 : 1 [L : Ni2+] stoichiometric complex, confirmed through Job's plot and ESI mass analysis with an estimated association constant of 2.61 × 106 M−2. The probe L could detect Ni2+ concentration down to 61 nM, 106 nM, and 129 nM via a UV-Vis spectrophotometer, smartphone-assisted RGB method, and test paper strip analysis. The binding mechanism of probe L with metal ions was studied using 1H NMR, ESI mass spectrometry, and DFT calculations. The zeta potential analysis showed a potential of −28.38 mV for the free ligand and +12.09 mV upon complexation with Ni2+. More importantly, the potential application of probe L includes the quantification of Ni2+ ions in various water samples through all three sensing approaches.

Abstract Image

智能手机辅助比色法检测半水介质中新型苯并噻唑-喹啉二联体镍离子。
在这项研究中,我们提出了三种不同的Ni2+离子的比色检测方法,采用专门设计的通过Knoevenagel缩合反应合成的苯并噻唑-喹啉二联体(L)。L的独特性质使其能够快速和选择性地响应Ni2+离子,使其成为实际应用的理想探针。探头L在正常情况下呈淡黄色。在与Ni2+离子相互作用后,L经历了从浅黄色到亮橙色的显着颜色变化,允许在半水介质中进行视觉检测。这种快速比色响应能够实时监测Ni2+浓度。在Ni2+离子存在下,L的吸收最大值由于配体到金属的电荷转移(LMCT)而发生了色移。探针L可形成2:1 [L: Ni2+]的化学计量配合物,经Job’s plot和ESI质谱分析证实,估计关联常数为2.61 × 106 M-2。探针L可通过紫外-可见分光光度计、智能手机辅助RGB法和试纸条分析检测低至61 nM、106 nM和129 nM的Ni2+浓度。利用1H NMR、ESI质谱和DFT计算研究了探针L与金属离子的结合机理。zeta电位分析表明,自由配体的电位为-28.38 mV,与Ni2+络合后的电位为+12.09 mV。更重要的是,探针L的潜在应用包括通过所有三种传感方法定量各种水样中的Ni2+离子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Analytical Methods
Analytical Methods CHEMISTRY, ANALYTICAL-FOOD SCIENCE & TECHNOLOGY
CiteScore
5.10
自引率
3.20%
发文量
569
审稿时长
1.8 months
期刊介绍: Early applied demonstrations of new analytical methods with clear societal impact
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