Coordination-Induced Multivalent Self-Assembling Catalysts for Spectral Sensing Zn2+ with High Selectivity and Sensitivity,Inorganic Chemistry

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Coordination-Induced Multivalent Self-Assembling Catalysts for Spectral Sensing Zn2+ with High Selectivity and Sensitivity
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2023-06-03 , DOI: 10.1021/acs.inorgchem.3c00545
Shuai-Bing Li ₁ , Jiang-Shan Shen _{1,

2}

Affiliation

The introduction of signal amplification to molecular spectral sensing systems is an intriguing topic in supramolecular analytical chemistry. In this study, click chemistry was used to generate a triazole moiety to bridge with a long hydrophobic alkyl chain (C_n) and another short alkyl chain (C_m) bearing a 1,4,7-triazacyclonane (TACN) group for efficiently generating a self-assembling multivalent catalyst, C_n-triazole-C_m-TACN·Zn²⁺ (n and m represent the carbon numbers of both alkyl chains, respectively; n = 16, 18, and 20; m = 2 and 6), to catalyze the hydrolysis of 2-hydroxypropyl-4-nitrophenyl phosphate (HPNPP) when Zn²⁺ was added. The triazole moiety introduced adjacent to the TACN group plays an important role in improving the selectivity of Zn²⁺ because the triazole moiety can participate in the coordination interaction between the Zn²⁺ and neighboring TACN group. The supplementary triazole complexing increases the space requirement for coordinated metal ions. This catalytic sensing system also shows high sensitivity, with a favorable limit of detection down to 350 nM, even if only UV–vis absorption spectra rather than more sensitive fluorescence techniques were used for signaling, and can be used to determine the concentration of Zn²⁺ in tap water, which demonstrates the practical application feasibility.

中文翻译：

配位诱导多价自组装催化剂用于高选择性和高灵敏度的 Zn2+ 光谱传感

将信号放大引入分子光谱传感系统是超分子分析化学中一个有趣的话题。在这项研究中，点击化学用于生成三唑部分，以与长疏水烷基链 (C _n ) 和另一个带有 1,4,7-三氮杂环烷 (TACN) 基团的短烷基链 (C _m ) 桥接，以有效生成自组装多价催化剂，C _n -三唑-C _m -TACN·Zn ²⁺（n和m分别代表两个烷基链的碳数；n = 16、18和20；m= 2 和 6), 当加入Zn ²⁺时催化磷酸 2-羟丙基-4-硝基苯酯 (HPNPP) 的水解。^{在TACN基团附近引入的三唑部分在提高Zn 2+}的选择性方面起着重要作用，因为三唑部分可以参与Zn ²⁺与相邻TACN基团之间的配位相互作用。辅助三唑络合增加了配位金属离子的空间需求。这种催化传感系统还显示出高灵敏度，具有低至 350 nM 的有利检测限，即使仅使用紫外 - 可见吸收光谱而不是更灵敏的荧光技术进行信号传递，并且可用于确定 Zn 2 的^浓度+在自来水中，证明了实际应用的可行性。

更新日期：2023-06-03

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