An unconventional chromophore in water-soluble polysiloxanes synthesized via thiol-ene reaction for metal ion detection
作者:Jinfeng Cao、Yujing Zuo、Hang Lu、Yiying Yang、Shengyu Feng
DOI:10.1016/j.jphotochem.2017.09.050
日期:2018.1
bonds is firstly found in water-soluble comb polysiloxanes (PETHs) with different ratios of polyether and mercaptopropyl groups as side chains. The PETHs are synthesized via efficient thiol-ene click reaction between polymercaptopropylmethylsiloxane (PMMS) and 2,5,8,11,14,17,20,23-octaoxahexacos-25-ene. The fluorescence is preliminarily assumed to be generated from through-space charge transfer because
非常规生色团S→Si配位键首先出现在水溶性梳状聚硅氧烷(PETHs)中,其中聚醚和巯基丙基的比例不同。的PETH s的合成经由polymercaptopropylmethylsiloxane之间(高效硫醇-烯点击反应PMMS)和2,5,8,11,14,17,20,23-octaoxahexacos-25烯。由于S→Si配位键使其更易于发生,因此初步假定荧光是通过空间电荷转移产生的。首先通过实验证明了S→Si配位键的存在,包括合成模型化合物和通过量子化学建模(Digambara Patra,2001年),Si NMR,XPS光谱和荧光光谱。此外,研究了这些化合物的荧光强度随温度,浓度和溶剂的变化规律。荧光强度随温度下降而提高。这种非常规生色团显示出AIEE(Valeur和Berberan-Santo,2017)(聚集诱导的发射增强)现象。PETH中的巯基和硫醚基团可以作用于Hg 2+和Fe 3+,从而破坏Si