含苯并三唑的 D-A 共轭聚合物的能带隙调制和光致电子转移荧光传感特性,Journal of Polymer Science

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含苯并三唑的 D-A 共轭聚合物的能带隙调制和光致电子转移荧光传感特性
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2023-10-17 , DOI: 10.1002/pol.20230552
Haoyue Luo ₁ , Jinyao Xu ₁ , Xinai Chen ₁ , Jiayi Wan ₁ , Hong Lei ₁ , Yinshuang Chen ₁ , Juhua Feng ₁ , Kuan Liu ₁

Affiliation

通过Suzuki偶联反应合成了两种新型含苯并三唑的共轭聚合物，并通过在苯并三唑两端引入噻吩单元设计受体单元的结构，得到了具有较低能带隙的聚合物。令人惊讶的是，经过修饰单元的D-A共轭聚合物的荧光发射从蓝光转变为黄光，并且该聚合物具有更高的荧光量子效率。此外，还引入噻吩苯并咪唑作为侧链单元用于研究光致电子转移（PET）机制。^{Fe 3+}和Cu ²⁺的添加对聚合物的荧光有显着的猝灭作用，高能带隙的聚合物表现出较高的荧光猝灭能力。此外，当探索阴离子存在下[P-Fe ³⁺ ]络合物的荧光传感时，观察到PO ₄³⁻与[P-Fe ³⁺ ]络合物竞争Fe ³⁺，中断了荧光传感最终导致荧光恢复的机制。本次调查中使用的 D-A 共轭聚合物设计方法为基于 PET 荧光传感的荧光传感器功能控制的新方法铺平了道路。

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Energy band gap modulation and photoinduced electron transfer fluorescence sensing properties of D–A conjugated polymers containing benzotriazole

Two new conjugated polymers containing benzotriazole were synthesized via Suzuki coupling reaction, and the polymer with lower energy band gap was created by designing the structure of the acceptor unit by introducing thiophene unit at both ends of the benzotriazole. Surprisingly, the fluorescence emission of D–A conjugated polymer with modified unit shifted from blue to yellow light, and the polymer had a higher fluorescence quantum efficiency. In addition, thiophen benzimidazole was introduced as the side chain unit for the study of photoinduced electron transfer (PET) mechanism. The addition of Fe³⁺ and Cu²⁺ caused significant quenching of fluorescence of polymers, and the polymer with high energy band gap exhibited higher fluorescence quenching ability. Moreover, when exploring the fluorescence sensing of [P-Fe³⁺] complex in the presence of anion, it was observed that the PO₄³⁻ competed with [P-Fe³⁺] complex for Fe³⁺, interrupting the fluorescence sensing mechanism eventually leading to the recovery of fluorescence. The design approach utilized in this survey for D–A conjugated polymer paves the way for a novel mean of functional control of fluorescence sensor based on PET fluorescence sensing.

更新日期：2023-10-17

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