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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Picosecond Linear Dichroism and Absorption Anisotropy of Hypocrellin: Toward a Unified Picture of the Photophysics of Hypericin and Hypocrellin
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Picosecond Linear Dichroism and Absorption Anisotropy of Hypocrellin: Toward a Unified Picture of the Photophysics of Hypericin and Hypocrellin

机译：皮秒的皮秒线性二向色性和吸收各向异性：形成金丝桃素和下皮素光物理的统一图景

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摘要

The photophysics of hypocrellin is examined by means of transient absorption spectroscopy. On the shortest time scale investigated, an ～10 ps component is observed in the isotropic ("magic angle") transient absorption, ΔA(t), and in the anisotropy decay, r(t), for hypocrellin in viscous solvents such as octanol and ethylene glycol. Because the excited-state intramolecular proton-transfer time of the related compound hypericin is ～10 ps, the observation of a transient of similar duration in hypocrellin is interpreted as evidence that the photophysics of hypericin and hypocrellin have common features. In particular, it is suggested that their ground- and excited-state potential energy surfaces are similar and that what distinguishes the observed kinetic behavior, which can differ significantly, is the ground-state heterogeneity, that is, the number and population of different forms of hypericin or hypocrellin, which may be tautomers, ions, or conformational isomers.
机译：通过瞬态吸收光谱法检查苏维他命的光物理性质。在研究的最短时间尺度上，在粘性溶剂（例如辛醇）中，对于亚甲三酚，在各向同性（“魔角”）瞬态吸收ΔA（t）和各向异性衰减r（t）中观察到〜10 ps的分量和乙二醇。由于相关化合物金丝桃素的激发态分子内质子转移时间为〜10 ps，因此在高脂蛋白中观察到类似持续时间的瞬态现象被解释为金丝桃素和高脂蛋白的光物理特性具有共同特征。特别是，建议它们的基态和激发态势能面相似，并且区别观察到的动力学行为（可能有显着差异）是基态异质性，即不同形式的数量和总体金丝桃素或hypercrellin可能是互变异构体，离子或构象异构体。

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