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首页> 外文期刊>ACS Omega >Azadioxatriangulenium and Diazaoxatriangulenium: Quantum Yields and Fundamental Photophysical Properties
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Azadioxatriangulenium and Diazaoxatriangulenium: Quantum Yields and Fundamental Photophysical Properties

机译：Azadioxatriangulenium和Diazaoxatriangulenium：量子产率和基本的光物理性质

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Over the last decade, we have investigated and exploited the photophysical properties of triangulenium dyes. Azadioxatriangulenium (ADOTA) and diazaoxatriangulenium (DAOTA), in particular, have features that make them useful in various fluorescence-based technologies (e.g., bioimaging). Through our work with ADOTA and DAOTA, we became aware that the reported fluorescence quantum yields (?_(fl)) for these dyes are lower than their actual values. We thus set out to further investigate the fundamental structure–property relationships in these unique conjugated cationic systems. The nonradiative processes in the systems were explored using transient absorption spectroscopy and time-resolved emission spectroscopy in combination with computational chemistry. The influence of molecular oxygen on the fluorescence properties was explored, and the singlet oxygen sensitization efficiencies of ADOTA and DAOTA were determined. We conclude that, for these dyes, the amount of nonradiative deactivation of the first excited singlet state (S_(1)) of the azaoxa-triangulenium fluorophores is low, that the rate of such deactivation is slower than what is observed in common cationic dyes, that there are no observable radiative transitions occurring from the first excited triplet state (T_(1)) of these dyes, and that the efficiency of sensitized singlet oxygen production is low (?_(Δ) ≤ 10%). These photophysical results provide a solid base upon which technological applications of these fluorescent dyes can be built.
机译：在过去的十年中，我们已经研究和开发了三角染料的光物理性质。尤其是，叠氮三triangulenium（ADOTA）和重氮三triangulenium（DAOTA）具有使它们可用于各种基于荧光的技术（例如生物成像）的功能。通过与ADOTA和DAOTA的合作，我们意识到这些染料的荧光量子产率（η_（fl））低于实际值。因此，我们着手进一步研究这些独特的共轭阳离子体系中的基本结构与性质之间的关系。使用瞬态吸收光谱和时间分辨发射光谱结合计算化学方法探索了系统中的非辐射过程。探索了分子氧对荧光性质的影响，并确定了ADOTA和DAOTA的单线态氧敏化效率。我们得出的结论是，对于这些染料，氮杂三碳原子团荧光团的第一个激发单线态（S_（1））的非辐射失活量很低，这种失活的速率比普通阳离子染料慢。这些染料的第一个激发三重态（T_（1））没有可观察到的辐射跃迁，并且敏化单重态氧的产生效率低（Δ_（Δ）≤10％）。这些光物理结果为这些荧光染料的技术应用奠定了坚实的基础。

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