Fluorescence Lifetimes and Quantum Yields of Rhodamine Derivatives: New Insights from Theory and Experiment

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• 作者：Marika Savarese ; Anna Aliberti ; Ilaria De Santo ; Edmondo Battista ; Filippo Causa ; Paolo A. Netti ; Nadia Rega
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：July 19, 2012
• 年：2012
• 卷：116
• 期：28
• 页码：7491-7497
• 全文大小：391K
• 年卷期：v.116,no.28(July 19, 2012)
• ISSN：1520-5215

文摘

Although lifetimes and quantum yields of widely used fluorophores are often largely characterized, a systematic approach providing a rationale of their photophysical behavior on a quantitative basis is still a challenging goal. Here we combine methods rooted in the time-dependent density functional theory and fluorescence lifetime imaging microscopy to accurately determine and analyze fluorescence signatures (lifetime, quantum yield, and band peaks) of several commonly used rhodamine and pyronin dyes. We show that the radiative lifetime of rhodamines can be correlated to the charge transfer from the phenyl toward the xanthene moiety occurring upon the S₀ 鈫?S₁ de-excitation, and to the xanthene/phenyl relative orientation assumed in the S₁ minimum structure, which in turn is variable upon the amino and the phenyl substituents. These findings encourage the synergy of experiment and theory as unique tool to design finely tuned fluorescent probes, such those conceived for modern optical sensors.