基于聚集诱导发光特性的荧光探针对汞离子的点亮型检测（英文）

A “Turn-on” Fluorescent Chemosensor with the Aggregation-induced Emission Characteristic for High-selective Detection of Hg^(2+)

首先通过二溴六苯基丁二烯(HPB-Br)与4-乙烯基吡啶的Heck反应,获得含有两个吡啶基团的六苯基丁二烯(HPB-Py),再用碘甲烷甲基化得到含有双甲基吡啶碘盐的目标产物:六苯基-1,3-丁二烯衍生物(HPB-PyM)。作为HPB-PyM的前体化合物,HPB-Br和HPB-Py显示出优异的聚集诱导发光(AIE)特性。而HPB-PyM则呈现出聚集诱导猝灭(ACQ)特性,其固体呈橙红色荧光,发射波长λem=605nm。当有汞离子存在的条件下,HPB-PyM基于AIE机制被点亮,并对Hg^(2+)的检测具有响应速度快、灵敏度高和选择性强的特点,线性检测的最低限为4.153μmol/L,证明HPB-PyM是一种新型"点亮"汞离子探针。

A hexaphenyl-1,3-butadiene E）- （ （ （ 1E, 3 E）- 1, 2, 3,4-tetraphenylb diyl） ） bis （N-methylpyridinium） iodide derivative containing methylpyridinium moiety, 4,4＇-（（1E, 1 uta-1, 3-diene-1, 4-diyD bis （1, 4 phenylene） ） bis （ ethene-1, 2 （HPB-PyM）, was firstly synthesized through Heck reaction of HPB-Br with 4-vinylpyridine and subsequent methylation with iodomethane. As the precursors of HPB-PyM, HPB-Br and HPB-Py showed excellent aggregation-induced emission characteristic. In contrast, HPB-PyM exhibited orange emission （λem = 605 rim） in the solid state with aggregationcaused quenching （ACQ） characteristic. Moreover, the fluorescence of HPB-PyM via AIE mechanism could be lightened and significantly enhanced by Hg2＋ ions. As a ＂turn on＂ probe, HPB-PyM not only exhibited a rapid, sensitive, and selective response towards Hg2＋ but also achieved linear and colorimetric detection for Hg2＋ with a detection limit of 4. 153 μmol/L.