Decoration of Terpyridine with Electron‐Rich Unit THDTAP: an Efficient Way to Explore Fluorescence Sensors for Recognizing Metal Ions
Decoration of Terpyridine with Electron‐Rich Unit THDTAP: an Efficient Way to Explore Fluorescence Sensors for Recognizing Metal Ions
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DOI：
10.1002/cjoc.201900226
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发表时间：
2019-09
影响因子：
5.4
通讯作者：
Taoshan Xu;Dongxu Li;Chaoxian Yan;Yuewei Wu;Cheng-Shan Yuan;X. Shao
中科院分区：
文献类型：
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作者：
Taoshan Xu;Dongxu Li;Chaoxian Yan;Yuewei Wu;Cheng-Shan Yuan;X. Shao
主要观察结果和结论总结将给电子单元2，3，4，6-四氢-1，6-二硫杂-3a-氮杂菲那烯（THDTAP）引入到三联吡啶（TPy）上，得到给体-受体（D-A）型TPy-配体（化合物2）。在2的THDTAP部分上的两个硫原子选择性氧化后，产生配体3 - 6。通过理论、电化学和光谱研究对2 - 6的电子结构进行了评价。硫原子的氧化对THDTAP基团的供电子能力产生显著影响，从而对2 - 6的分子内电荷转移（ICT）以及2 - 6与金属离子的配合物的电子激发态产生精细的调制。基于2 - 6对金属离子的光学响应，采用2和3作为组合荧光传感器，建立了对Zn2+、Cd2+和Ag+离子的分步识别.
Summary of main observation and conclusionThe electron‐donating unit 2,3,4,6‐tetrahydro‐1,6‐dithia‐3a‐azaphenalene (THDTAP) was introduced onto terpyridine (TPy) to give a donor‐acceptor (D‐A) type TPy‐ligand (compound2). Upon selective oxidation of two sulfur atoms on the THDTAP moiety of2, the ligands3—6were created. The electronic structures of2—6were evaluated by theoretical, electrochemical, and spectroscopic investigations. The oxidation on the sulfur atoms brings significant influence on the electron‐donating ability of THDTAP moiety, subsequently, leads to fine modulations on intramolecular charge‐transfer (ICT) of2—6and the electronically excited states of the complexes of2—6with metal ions. Based on the optical response of2—6toward metal ions, the step‐by‐step recognition of Zn2+, Cd2+, and Ag+ions is set up by employing2and3as combined fluorescence sensors.