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首页> 外文期刊>Chemistry: A European journal >Aminorhodamine (ARh): A Bichromophore with Three Emission Bands in Low Temperature Glasses
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Aminorhodamine (ARh): A Bichromophore with Three Emission Bands in Low Temperature Glasses

机译：Aminorhodamine（ARh）：低温玻璃中具有三个发射带的双色团

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摘要

At first glance, aminorhodamine (ARh) is a typical pH responsive fluorescent, rhodamine-type dye. However, hidden under the typical rhodamine absorption band, ARh has another electronic transition of similar energy, but polarized orthogonal to that of the rhodamine chromophore. This transitionassigned to an arylpyrylium type chromophore contained in the systemis responsible for the sensor action of the dye. ARh is non-fluorescent, while protonation of a donor amino group turn on a strong rhodamine-type emission. At low temperature in frozen solution emission from both electronic subsystems of ARh are observed. In order to achieve more complete understanding of the photophysical mechanisms in this type of fluorescent probes, ARh and its protonated counterpart HARh were studied by absorption and fluorescence spectroscopy, computational chemistry, and at low temperatures in solid solution. Results from fluorescence anisotropy and time-resolved fluorescence spectra establish a bichromophore model and suggest that a remarkable weak coupling between the two nearly isoenergetic excited states in ARh enables the dual emission. All the complicated properties observed for ARh was accounted for by a bichromophore model describing the electronic system of ARh as a bichromophore constituted by a rhodamine and an arylpyrylium subsystem.
机译：乍一看，氨基若丹明（ARh）是一种典型的pH响应型荧光罗丹明型染料。但是，ARh隐藏在典型的若丹明吸收带下，具有另一个具有相似能量的电子跃迁，但极化与若丹明生色团的极化正交。该转变被分配给系统中包含的芳基吡啶类生色团，负责染料的传感作用。 ARh是不发荧光的，而供体氨基的质子化会开启强的若丹明型发射。在冷冻溶液的低温下，观察到来自ARh的两个电子子系统的发射。为了更全面地了解此类荧光探针中的光物理机制，通过吸收和荧光光谱，计算化学以及在低温下对固溶体中的ARh及其质子化的HARh进行了研究。荧光各向异性和时间分辨荧光光谱的结果建立了双色团模型，表明ARh中两个几乎等能量激发态之间的显着弱耦合使得能够进行双重发射。双生色团模型解释了ARh观察到的所有复杂性质，该模型将ARh的电子系统描述为由若丹明和芳基吡啶鎓子系统组成的双生色团。

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