ICG重审:激发状态动态作为染料度和溶剂环境的函数
Maria T Lahm1, Pascal Rauthe1, Kai-Ching Fan2
1Karlsruhe Institute of Technology, Institute of Physical Chemistry, 76131 Karlsruhe, Germany. andreas.unterreiner@kit.edu.
Dalton transactions (Cambridge, England : 2003)
|October 4, 2025
概括
这项研究调查了氨酸绿色 (ICG) 染料.
科学领域:
- 光物理学的光学物理学
- 频谱学是一种光谱学.
- 纳米粒子科学 科学 纳米粒子科学
背景情况:
- 印ocyanine绿 (ICG) 是医学成像和光动力学疗法的重要染料.
- 它融入无机混合纳米粒子 (IOH-NP) 增强了针对性的治疗效果,特别是在光热应用中.
- 了解ICG在不同环境中的光物理特性对于优化其在IOH-NP中的功能至关重要.
研究的目的:
- 调查溶剂和度对绿色氨酸 (ICG) 激发状态动态的影响.
- 阐明ICG在各种度和溶剂,包括乙醇,DMSO和水中的光物理行为.
- 建立激发状态寿命,光量子产量和聚合现象之间的相关性.
主要方法:
- 采用了稳定状态和时间分辨率的光谱方法,包括与时间相关的单光子计数 (TCSPC) 和秒短暂吸收光谱.
- 在乙醇,DMSO和非矿物化水中的ICG光物理特征,其度范围为0.08至100μM.
- 分析了吸收光谱,光量子收益率 (fQY) 和兴奋状态放松动态.
主要成果:
- 在乙醇和DMSO中观察到度独立的吸收,但在水中观察到度依赖的H聚合.
- 光量子产量随着ICG度在~0.2μM以上的增加而下降,溶剂之间存在显著差异 (22%在EtOH中,42%在DMSO中,5%在水中).
- 激发状态的寿命在500-600 ps (EtOH),700-900 ps (DMSO) 和120-160 ps (水) 之间,这表明水溶液中的非辐射衰变增加. 动力学是独立于EtOH和DMSO中的度,但对水中的聚合敏感.
结论:
- 溶剂和度显著影响ICG的光物理性质,特别是水溶液中的聚合和兴奋状态动态.
- 在所有测试条件下,激发状态寿命和光量子产量之间存在直接相关性.
- 这些发现对于基于ICG的纳米药物和成像剂的合理设计和应用至关重要.
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