A new fluorescent sensor was developed, in which pyrene is conjugated to calix[4]triazolium via an ester linker, and its ability to bind anions was investigated. Interestingly, addition of HSO₄⁻ to Py-CT4 resulted in increased fluorescence, but other anions had little effect. This phenomenon is attributed to the formation of a 1 : 1 stoichiometric Py-CT4–HSO₄⁻ complex that interferes with the photoinduced electron transfer (PET) process. The selectivity of Py-CT4 for HSO₄⁻ is the result of appropriate spatial complementarity to, and hydrogen bond interaction with, HSO₄⁻. The binding mode and fluorescence changes caused by the PET process can be explained well by density functional theory (DFT) calculations.

中文翻译：

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用于荧光识别硫酸氢盐的芘-杯[4]三唑结合物


开发了一种新型荧光传感器，其中芘通过酯连接体与杯[4]三唑结合，并研究了其结合阴离子的能力。有趣的是，在 Py-CT4 中添加 HSO ₄ ⁻ 导致荧光增强，但其他阴离子几乎没有影响。这种现象归因于 1:1 化学计量 Py-CT4–HSO ₄ ⁻ 复合物的形成，该复合物干扰光诱导电子转移 (PET) 过程。 Py-CT4 对 HSO ₄ ⁻ 的选择性是与 HSO ₄ ⁻