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Excited-state intramolecular proton transfer of 2-acetylindan-13-dione studied by ultrafast absorption and fluorescence spectroscopy

机译:超快吸收和荧光光谱研究2-乙酰基茚满-13-二酮的激发态分子内质子转移

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摘要

We employ transient absorption from the deep-UV to the visible region and fluorescence upconversion to investigate the photoinduced excited-state intramolecular proton-transfer dynamics in a biologically relevant drug molecule, 2-acetylindan-1,3-dione. The molecule is a ß-diketone which in the electronic ground state exists as exocyclic enol with an intramolecular H-bond. Upon electronic excitation at 300 nm, the first excited state of the exocyclic enol is initially populated, followed by ultrafast proton transfer (≈160 fs) to form the vibrationally hot endocyclic enol. Subsequently, solvent-induced vibrational relaxation takes place (≈10 ps) followed by decay (≈390 ps) to the corresponding ground state.
机译:我们采用从深紫外线到可见光区域的瞬态吸收和荧光上转换,以研究生物相关药物分子2-乙酰基茚满-1,3-二酮中的光诱导激发态分子内质子转移动力学。该分子是一个β-二酮,在电子基态下以带有分子内氢键的环外烯醇存在。在300 nm处进行电子激发后,首先填充环外烯醇的第一个激发态,然后进行超快质子转移(≈160fs)以形成振动热的环内烯醇。随后,发生溶剂诱导的振动弛豫(≈10ps),然后衰减(≈390ps)到相应的基态。

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