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一种新型咔唑基水相人工光捕获体系
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Abstract:
本文利用水溶性羧酸盐柱[5]芳烃(WH5)作为大环主体分子，与具有聚集诱导发光(AIE)活性的咔唑基衍生物(CPD)通过主–客体相互作用形成稳定的WH5-CPD复合物。该WH5-CPD复合物通过超分子自组装过程在水相中构筑了显著的WH5-CPD纳米颗粒聚集体，并展现出独特的双功能特性：一方面，基于CPD自身的AIE荧光特性，聚集后的WH5-CPD可充当初级能量供体；另一方面，凭借WH5与CPD组装形成的空腔结构实现了荧光桃红(PHB)染料分子的高效包载，最终构建出具有层级能量传递功能的WH5-CPD-PHB三元光捕获系统。实验数据表明，当体系中CPD与PHB的摩尔比优化至250:1时，实现了高达43%的荧光共振能量转移效率，同时获得23.2的天线效应值，这两个关键指标均显著优于传统光捕获体系，为开发高效水相人工光捕获系统提供了新的策略。
In this paper, a water-soluble carboxylate-pillar [5] arene (WH5) was innovatively used as a macrocyclic host molecule, and a photoactive carbazole-based derivative (CPD) with aggregation-induced emission (AIE) ability was used as a guest molecule, which was interacted with the host to form a stable WH5-CPD complex. The complex constructs a regular nanoparticle aggregates structure in the aqueous phase through the self-assembly process, showing unique bifunctional properties: on the one hand, the aggregated WH5-CPD nanoparticles could act as a primary energy donor based on the AIE fluorescence characteristics of CPD, and on the other hand, the efficient encapsulation of fluorescent Phloxine (PHB) dye molecules was realized by the nano-cavity structure of WH5-CPD assembly, finally resulting in the successful construction of the ternary WH5-CPD-PHB light-harvesting system with hierarchical energy transfer function. The experimental data showed that when the molar ratio of CPD to PHB in the system was optimized to 250:1, the fluorescence resonance energy transfer efficiency was up to 43%, and the antenna effect value of 23.2 was obtained, which was significantly better than that of traditional light-harvesting system, providing an innovative strategy for the development of efficient aqueous artificial light-harvesting systems.
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