Triphenylamine-Based Polythioacetal for Selective Sensing of Mercury(II) with High Specificity and Sensitivity,ACS Applied Materials & Interfaces

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Triphenylamine-Based Polythioacetal for Selective Sensing of Mercury(II) with High Specificity and Sensitivity
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2024-02-21 , DOI: 10.1021/acsami.3c19521
Yu Gu ₁ , Ruixin Jia ₁ , Yue Yu ₁ , Siyong Li ₁ , Jianjian Zhu ₁ , Xinxin Feng ₂ , Yanbing Lu ₁

Affiliation

Utilizing the mercury (Hg²⁺)-triggered deprotection of thioacetals to aldehyde groups, we constructed a water-soluble triphenylamine (TPA)-based polythioacetal PTA-TPA with thioacetal groups in the backbones for efficient sensing of Hg²⁺ in aqueous solutions. PTA-TPA is conveniently prepared by polycondensation of 3, 6-dioxa-1,8-octanedithiol (DODT) with 4-(N,N-diphenylamino) benzaldehyde (TPA-CHO) using thiol-terminated mPEG2k-SH as a capping agent. The interaction of Hg²⁺ with PTA-TPA activates the aggregation-induced emission (AIE) process of TPA-CHO molecules, which makes the emission enhanced, and the emission color changes to sky blue, while other metal ions do not interfere with the sensing process. PTA-TPA can be used as a highly selective and ultrafast detection system for Hg²⁺ with a low detection limit (LOD) of 9.88 nM and a fast response of less than 1 min. In addition, the prepared test strips report the presence of Hg²⁺ with an LOD as low as 1 × 10^–5 M. Intracellular imaging applications have demonstrated that PTA-TPA acts as a biocompatible fluorescent probe for efficient Hg²⁺ sensing in HeLa cells. Overall, the PTA-TPA fluorescence probes have the characteristics of easy synthesis, cost-effective, ultrafast detection speed, high selectivity, and high sensitivity, which can be used in practical applications.

中文翻译：

基于三苯胺的聚硫缩醛，用于选择性传感汞 (II)，具有高特异性和灵敏度

利用汞 (Hg ²⁺ ) 触发的硫缩醛脱保护为醛基，我们构建了一种基于水溶性三苯胺 (TPA) 的聚硫缩醛 PTA-TPA，其骨架上具有硫缩醛基团，可有效传感水溶液中的 Hg ²⁺ 。 PTA-TPA 可以通过使用硫醇封端的 mPEG2k-SH 作为封端剂，通过 3, 6-二氧杂-1,8-辛二硫醇 (DODT) 与 4-( N , N -二苯氨基) 苯甲醛 (TPA-CHO) 缩聚来方便地制备。 Hg ²⁺与 PTA-TPA 的相互作用激活了 TPA-CHO 分子的聚集诱导发射（AIE）过程，使发射增强，发射颜色变为天蓝色，而其他金属离子不干扰传感过程。 PTA-TPA 可用作 Hg ²⁺的高选择性和超快速检测系统，检测限 (LOD) 为 9.88 nM，快速响应时间小于 1 分钟。此外，制备的测试条报告了 Hg ²⁺的存在，LOD 低至 1 × 10 ^–5 M。细胞内成像应用表明，PTA-TPA 可作为生物相容性荧光探针，在 HeLa 中高效检测 Hg ²⁺细胞。总体而言，PTA-TPA荧光探针具有合成容易、成本低廉、检测速度超快、选择性高、灵敏度高等特点，可在实际应用中使用。

更新日期：2024-02-21

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