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Benzoquinone-imidazole hybrids as selective colorimetric sensors for cyanide in aqueous, solid and gas phases

机译：苯并醌 - 咪唑杂交物作为氰化物中的氰化物中的选择性比色传感器在水性，固态和气相中

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摘要

Five new chemosensors (R1-R5), possessing benzoquinone as the signaling unit and imidazole as the H-bond donor unit, for cyanide sensing have been rationally designed, synthesized and characterized by NMR and mass spectroscopy. The structure of R5 was confirmed by single crystal XRD studies. These receptors exhibited a prominent visual colour change toward the cyanide ion over other common anions in an aqueous HEPES buffer-DMF (9 : 1 v/v) medium. The complexation of receptor-CN- has been addressed by UV-Vis, fluorescence and H-1 NMR spectra and was supported by electrochemical and DFT studies. The mechanism of sensing involves formation of H-bonds between imidazole N-H and CN- ions. The stoichiometry of the receptor-CN complexes was found to be 1 : 2 (receptor-CN) and the detection limit was observed to be in the range of 1.1-3 nM. The test strips based on R5 were fabricated and could act as convenient and efficient CN- test kits. Notably, the novelty of the present investigation is that the receptor R5 selectively senses CN- ions in solid, aqueous and gas phases i.e. 'a complete receptor'.
机译：五种新的化学传感器（R1-R5），具有苯醌作为信号单元和咪唑作为H键合供体单元，用于氰化物的氰化物感应已经合理设计，合成和以NMR和质谱为特征。单晶XRD研究证实R5的结构。这些受体表现出朝向氰化物离子在含水HEPES缓冲剂-DMF（9：1V / v）培养基中的其他常见阴离子上的突出视觉色。通过UV-Vis，荧光和H-1 NMR光谱解决了受体-CN-的络合，并通过电化学和DFT研究支持。感测机制涉及在咪唑N-H和CN-离子之间形成H键。发现受体-CN配合物的化学计量为1：2（受体-CN），观察到检测极限为1.1-3nm。制造基于R5的测试条，并可作为方便，高效的CN测试试剂盒。值得注意的是，本研究的新颖性是受体R5选择性地检测固体，水性和气相中的CNIE，即“完全受体”。

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  • 来源
    《RSC Advances》 |2015年第106期|共11页
  • 作者

    Manivannan Ramalingam; Ciattini Samuele; Chelazzi Laura; Elango Kuppanagounder P.;

  • 作者单位

    Deemed Univ Gandhigram Rural Inst Dept Chem Gandhigram 624302 India;

    Univ Florence Ctr Cristallog Strutturale I-50019 Sesto Fiorentino Fi Italy;

    Univ Florence Ctr Cristallog Strutturale I-50019 Sesto Fiorentino Fi Italy;

    Deemed Univ Gandhigram Rural Inst Dept Chem Gandhigram 624302 India;

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  • 正文语种 eng
  • 中图分类 化学;
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