Polytriazole bridged with 2,5-diphenyl-1,3,4-oxadiazole moieties: a highly sensitive and selective fluorescence chemosensor for Ag<sup>+</sup>
作者:Shoupeng Cao、Zhichao Pei、Yongqian Xu、Ruina Zhang、Yuxin Pei
DOI:10.1039/c5ra07822a
日期:——
Fluorescent conjugated polytriazoles (FCP 1–4) containing both 2,5-diphenyl-1,3,5-oxadiazole (OXD) and 1,2,3-triazole moieties in the main chain were synthesized from aromatic diazide (1) and dialkynes (2–5) via click polymerization, respectively. In the polymers, OXDs (fluorophores) and triazole rings (generated via CuAAC acting as metal ion ligands) comprise a fluorescent system. The polytriazoles
由芳族二叠氮化物(1)和二炔合成了主链上同时包含2,5-二苯基-1,3,5-恶二唑(OXD)和1,2,3-三唑部分的荧光共轭聚三唑(FCP 1-4)(2–5)分别通过单击聚合。在聚合物中,OXD(荧光团)和三唑环(通过充当金属离子配体的CuAAC生成)构成荧光系统。在室温下,聚三唑在DMF中表现出相对较强的发射,量子产率在0.20–0.28范围内。对它们的离子响应特性的研究表明,尽管所有四个FCP对Ag +具有良好的选择性,烷氧基侧基(FCP 2为甲氧基,FCP 3为己氧基,FCP 4为2-乙基己氧基)与聚三唑的主链结合,通过改变聚合物的聚集状态和电子密度,降低了其对Ag + 的敏感性。主链。因此,FCP 1对Ag +高度敏感,其K sv高达1.44×10 5 M -1,其最低检测限在ppb范围内(4.22×10 -7 M)。这项研究为合成新型的Ag +荧光传感器提供了一种有效的点击方法