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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Polarization and symmetry of electronic transitions in long fluorescence lifetime triangulenium dyes
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Polarization and symmetry of electronic transitions in long fluorescence lifetime triangulenium dyes

机译：长荧光寿命三角染料中电子跃迁的极化和对称性

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摘要

To fully exploit the capabilities of fluorescence probes in modern experiments, where advanced instrumentation is used to probe complex environments, other photophysical properties than emission color and emission intensity are monitored. Each dye property can be addressed individually as well as collectively to provide in-depth information unavailable from the standard intensity measurements. Dyes with long emission lifetimes and strongly polarized transitions enable the monitoring of lifetime changes as well as emission polarization (anisotropy). Thus experiments can be designed to follow slow dynamics. The UV and visible electronic transitions of a series of red-emitting dyes based on the triangulenium motif are investigated. We resolve overlapping features in the spectra and assign the orientation of the transition moments to the molecular axes. The result is the complete Jablonski diagram for the UV and visible spectral region. The symmetries of the studied dyes are shown to have a large influence on the optical response, and they are clearly separated into two groups of symmetry by their photophysical properties. The C_(2v) symmetric dyes, azadioxatriangulenium (ADOTA~+) and diazaoxatriangulenium (DAOTA~+), have high emission anisotropies, fluorescence lifetimes around 20 ns, and fluorescence quantum yields of ～50%. The trioxatriangulenium (TOTA~+) and triazatriangulenium (TATA~+) dyes - nominally of D_(3h) symmetry - have fluorescence lifetimes around 10 ns lifetimes and fluorescence quantum yields of 10-15%. However, the D_(3h) symmetry is shown to be lowered to a point group, where the axes transform uniquely such that the degeneracy of the E′ states is lifted.
机译：为了在现代实验中充分利用荧光探针的功能，在现代实验中，先进的仪器被用来探测复杂的环境，除了发射颜色和发射强度外，还监测了其他光物理性质。每种染料的性质都可以单独或共同解决，以提供标准强度测量无法提供的深入信息。具有长发射寿命和强极化跃迁的染料可以监测寿命变化以及发射极化（各向异性）。因此，可以将实验设计为遵循慢速动力学。研究了基于三角基序的一系列红色发光染料的紫外和可见电子跃迁。我们解析光谱中的重叠特征，并将跃迁矩的方向分配给分子轴。结果是紫外和可见光谱区域的完整Jablonski图。所研究的染料的对称性显示对光学响应有很大影响，并且它们的光物理性质将它们清楚地分为两组对称性。 C_（2v）对称染料，氮杂二三triangulenium（ADOTA〜+）和二氮杂三triangulenium（DAOTA〜+），具有较高的发射各向异性，荧光寿命约为20 ns，荧光量子产率约为50％。名义上具有D_（3h）对称性的三氧三triangulenium（TOTA〜+）和三氮杂triangulenium（TATA〜+）染料的荧光寿命约为10 ns，荧光量子产率为10-15％。但是，D_（3h）对称性显示为降低到一个点组，在该点组中，轴唯一地变换，从而提升了E'状态的简并性。

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