Dipyrrolylquinoxaline-bridged hydrazones: a new class of chemosensors for copper(II)
作者:Qian-ni Guo、Cheng Zhong、Yun-guo Lu、Chuang Shi、Zao-ying Li
DOI:10.1007/s10847-011-9941-6
日期:2012.2
Novel 2,3-bis(1H-pyrrol-2-yl)quinoxaline-functionalized hydrazones were prepared and characterized as new chemosensors for copper(II) ion. The binding properties of the compounds 4, 5, 6 and 7 for cations were examined by UV–vis, fluorescence spectroscopy, and linear sweep voltammetric experiments (LSV). The results indicate that a 1:1 stoichiometric complex is formed between compound 4 (or 5, 6, 7) and copper(II) ion, and the association constant is 1.3 × 105 M−1 for 4, 2.1 × 106 M−1 for 5, 4.1 × 105 M−1 for 6 and 8.0 × 105 M−1 for 7, respectively. The recognition mechanism between compound 4 (or 5, 6, 7) and metal ion was discussed based on their electrochemical properties, absorbance changes, and the fluorescence quenching effect when they interact with each other. Control experiments revealed that compound 4 (or 5, 6, 7) has a highly selective response to copper (II) ion.
制备了新型2,3-双(1H-吡咯-2-基)喹喔啉功能腙,并将其作为铜(II)离子的新型化学传感器进行了表征。通过紫外-可见光、荧光光谱和线性扫描伏安法实验(LSV)研究了化合物4、5、6和7与阳离子的结合性质。结果表明,化合物4(或5、6、7)与铜(II)离子之间形成1:1的化学计量复合物,其结合常数分别为1.3 × 105 M−1(化合物4)、2.1 × 106 M−1(化合物5)、4.1 × 105 M−1(化合物6)和8.0 × 105 M−1(化合物7)。根据化合物4(或5、6、7)与金属离子相互作用时的电化学性质、吸光度变化和荧光淬灭效应,讨论了它们之间的识别机制。对照实验表明,化合物4(或5、6、7)对铜(II)离子具有高度选择性的响应。