Abstract

The host–guest binding characteristics of cyclopentanocucurbit[6]uril (CyP₆Q[6]) and cyanine dye trans-4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide (t-DSMI) have been studied. The results show that CyP₆Q[6] and t-DSMI form a 1:1 inclusion system, generating strong fluorescence. On this basis, the fluorescent probe t-DSMI@CyP₆Q[6] has been constructed, and its anion recognition ability has been investigated. In a neutral environment, BF₄⁻, H₂PO₄⁻, and I⁻ elicit obvious specific responses from the probe, since they have stronger binding forces. This probe shows greater sensitivity than the previously reported probe t-DSMI@HMeQ[6].

Graphic abstract

Since the complex formed by CyP₆Q[6] and t-DSMI can produce strong fluorescence at pH > 4.6, t-DSMI@CyP₆Q[6] was constructed to recognize the anions at pH ≅ 5. The results show that in a near neutral environment, BF₄⁻, H₂PO₄⁻, and I⁻ elicit obvious specific responses from the probe.

中文翻译：

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反式-4- [4-（二甲基氨基）苯乙烯基] -1-甲基吡啶碘鎓@环戊烷葫芦[6]尿素作为阴离子识别的荧光探针

摘要

研究了环戊anocucurbit [6]尿嘧啶（CyP ₆ Q [6]）和花青染料反式-4- [4-（二甲基氨基）苯乙烯基] -1-甲基吡啶碘（t -DSMI）的主客体结合特性。结果表明，CyP ₆ Q [6]和t -DSMI形成1：1的包裹体，产生强荧光。在此基础上，构建了荧光探针t -DSMI @ CyP ₆ Q [6]，并对其阴离子识别能力进行了研究。在中性环境，BF ₄ ^-，H ₂ PO ₄ ^-和I ^-由于它们具有更强的结合力，因此会引起探针明显的特异性反应。该探针比以前报道的探针t -DSMI @ HMeQ [6]具有更高的灵敏度。

图形摘要

由于通过的CyP形成的复合物₆ Q [6]和吨-DSMI可以在pH> 4.6产生强烈的荧光，吨-DSMI @ CyP的₆ Q [6]构建以识别在pH阴离子 ≅  5中。结果表明，在近中性的环境，BF ₄ ^-，H ₂ PO ₄ ^-和我^-从探头引导学生明显具体的回应。