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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Residual and exploitable fluorescence in micellar self-assembled ON-OFF sensors for copper(II)
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Residual and exploitable fluorescence in micellar self-assembled ON-OFF sensors for copper(II)

机译：胶束自组装的铜（II）开关传感器中的残留和可利用的荧光

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摘要

A set of new ligands, L2H(2)-L5H(2), containing the 1,4,8,11-tetraaza-5,7-dione framework has been prepared, The ligands feature lipophilic substituents either on the carbon atom in the 6 position or on the amino groups, or on both. The solution behaviour of the ligands when included in TritonX-100 micelles has been investigated by means of potentiometric titrations and protonation and complexation constants for the Cu2+ cation have been determined in micellar medium. Micellar assemblies containing the ligands and pyrene have been prepared, and coupled pH-metric and fluorimetric titrations allowed the determination of the response of the systems as ON-OFF fluorescent sensors for Cu2+. A correlation between the effective lipophilicity of the ligand and the residual fluorescence (i.e. the fluorescence of the OFF state) was observed, and with the more lipophilic ligand, L3H(2), we obtained a residual fluorescence as low as 8%, with a significant improvement with respect to other published systems. On the other hand, introduction of functionalities on the amino groups of 1,4,8,11-tetraaza-5,7-dione brings the drawback of a small but significant decrease of the exploitable fluorescence, i.e. the fluorescence of the system in the absence of added Cu2+, at the pH value suitable for full metal complexation.
机译：制备了一组新的配体L2H（2）-L5H（2），其中包含1,4,8,11-四氮杂-5,7-二酮骨架。这些配体在碳原子上具有亲脂性取代基6位或在氨基上，或在两个位置上。已经通过电位滴定法研究了配体包含在TritonX-100胶束中时的溶液行为，并在胶束介质中确定了Cu2 +阳离子的质子化和络合常数。已经制备了含有配体和pyr的胶束组件，并且通过pH滴定和荧光滴定相结合，可以确定作为Cu2 +的开-关荧光传感器的系统的响应。观察到配体的有效亲脂性与残留荧光（即OFF状态的荧光）之间的相关性，并且使用亲脂性更高的配体L3H（2），我们获得了低至8％的残留荧光。与其他已发布系统相比，有了显着改进。另一方面，在1,4,8,11-四氮杂-5,7-二酮的氨基上引入官能团带来了可利用的荧光（即系统中的荧光）少量但显着降低的缺点。在适合全金属络合的pH值下不添加Cu2 +。

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