Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China.
Division of Nanophotonics CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
ACS Appl Mater Interfaces. 2020 May 20;12(20):22552-22559. doi: 10.1021/acsami.0c03894. Epub 2020 May 8.
Organic materials that show substantial reactivity under visible light have received considerable attention due to their wide applications in chemical and biological systems. Hemicyanine pigments possess a strong intramolecular donor-acceptor structure and thereby display intense absorption in the visible spectral region. However, most excitons are consumed via the twisted intramolecular charge-transfer (TICT) process, making hemicyanines generally inert to light. Herein, we describe the development of an amphiphilic hemicyanine dye whose aggregation could be easily regulated using salt or counterions. More importantly, its intrinsic photoreactivity was successfully induced by steric restriction and cofacial arrangement within the H-aggregate, thus creating an effective photobactericide. This strategy could be extended to the development of photocatalysts for photosynthesis and a photosensitizer for photodynamic therapy.
由于在化学和生物体系中有着广泛的应用，对在可见光下表现出显著反应性的有机材料的研究引起了人们的极大关注。半花菁类染料具有强烈的分子内给体-受体结构，因此在可见光区有很强的吸收。然而，大多数激子通过扭曲的分子内电荷转移（TICT）过程消耗，使得半花菁类染料通常对光不敏感。在此，我们描述了一种两亲性半花菁染料的发展，其聚集态可以很容易地通过盐或抗衡离子来调节。更重要的是，其内在的光反应性可以通过在 H-聚集体中的空间位阻和共面排列来成功诱导，从而产生有效的光细菌杀灭剂。这种策略可以扩展到用于光合作用的光催化剂和用于光动力疗法的光敏剂的开发。
