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首页> 外文期刊>RSC Advances >Organoboron copolymers containing thienothiophene and selenophenothiophene analogues: optical, electrochemical and fluoride sensing properties
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Organoboron copolymers containing thienothiophene and selenophenothiophene analogues: optical, electrochemical and fluoride sensing properties

机译：含有噻吩并噻吩和硒代噻吩类似物的有机硼共聚物：光学，电化学和氟化物传感性能

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摘要

Conjugated donor–acceptor (D–A) copolymers possessing alternating fused bicyclic aromatic rings thieno[3,2-b]thiophene, selenopheno[3,2-b]thiophene, thieno[2,3-b]thiophene and selenopheno[2,3-b]thiophene as donors, thiophene as a π-conjugated bridge and mesitylboron as an acceptor were synthesized and characterized by spectroscopic methods. Large Stokes shifts of 96–166 nm were recorded and the solution quantum yields of the polymers were in the range of 5–18%. Their ionization potentials and electron affinities were investigated by cyclic voltammetry. Optical band gaps varied between 2.26 and 2.78 eV. (TD)-DFT studies were performed to unveil their electronic structures, Kohn–Sham orbitals and electronic transitions. Absorption and emission measurements revealed that these polymers have high sensitivity to fluoride anions, among which the polymer possessing cross-conjugated thienothiophene units had the best sensing properties supported by orbital composition analysis with Mulliken partition. Thus, copolymers P1–P4 could be used as colorimetric and fluorescent sensors for small fluoride anions.
机译：具有交替稠合的双环芳环噻吩并[3,2- b ]噻吩，硒烯并[3,2- b ]噻吩的共轭给体-受体（DA）共聚物，合成了噻吩并[2,3- b ]噻吩和硒吩并[2,3- b ]噻吩，噻吩为π-共轭桥，均三甲苯磺隆为受体。并用光谱学方法表征。记录到96-166 nm的大斯托克斯位移，聚合物的溶液量子产率在5-18％的范围内。通过循环伏安法研究了它们的电离势和电子亲和力。光学带隙在2.26和2.78 eV之间变化。 （TD）-DFT研究旨在揭示其电子结构，Kohn-Sham轨道和电子跃迁。吸收和发射测量表明，这些聚合物对氟阴离子具有很高的敏感性，其中具有交叉共轭噻吩并噻吩单元的聚合物具有Mulliken分区的轨道组成分析所支持的最佳传感性能。因此，共聚物P1-P4可用作小氟阴离子的比色和荧光传感器。

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