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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >External Electric Field Effects on Excited-State Intramolecular Proton Transfer in 4 '-N,N-Dimethylamino-3-hydroxyflavone in Poly(methyl methacrylate) Films
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External Electric Field Effects on Excited-State Intramolecular Proton Transfer in 4 '-N,N-Dimethylamino-3-hydroxyflavone in Poly(methyl methacrylate) Films

机译：外部电场对聚甲基丙烯酸甲酯薄膜中4'-N，N-二甲基氨基-3-羟基黄酮的激发态分子内质子转移的影响

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摘要

The external electric field effects on the steady-state electronic spectra and excited-state dynamics were investigated for 4'-N,N-(dimethylamino)-3-hydroxyflavone (DMHF) in a poly(methyl methacrylate) (PMMA) film. In the steady-state spectrum, dual emission was observed from the excited states of the normal (N*) and tautomer (T*) forms. Application of an external electric field of 1.0 MV.cm(-1) enhanced the N* emission and reduced the T* emission, indicating that the external electric field suppressed the excited-state intramolecular proton transfer (ESIPT). The fluorescence decay profiles were measured for the N* and T* forms. The change in the emission intensity ratio N*/T* induced by the external electric field is dominated by ESIPT from the Franck-Condon excited state of the N* form and vibrational cooling in potential wells of the N* and T* forms occurring within tens of picoseconds. Three manifolds of fluorescent states were identified for both the N* and T* forms. The excited-state dynamics of DMHF in PMMA films has been found to be very different from that in solution due to intermolecular interactions in a rigid environment.
机译：研究了聚甲基丙烯酸甲酯（PMMA）薄膜中4'-N，N-（二甲基氨基）-3-羟基黄酮（DMHF）对稳态电子光谱和激发态动力学的外部电场影响。在稳态光谱中，从正常（N *）和互变异构体（T *）形式的激发态观察到双重发射。施加1.0 MV.cm（-1）的外部电场会增强N *发射并降低T *发射，这表明外部电场会抑制激发态分子内质子转移（ESIPT）。测量了N *和T *形式的荧光衰减曲线。 ESIPT从N *形式的Franck-Condon激发态以及N *和T *形式的势阱中发生的振动冷却中，决定了外部电场引起的发射强度比N * / T *的变化。几十皮秒。对于N *和T *形式，鉴定出三个荧光状态的歧管。由于在刚性环境中的分子间相互作用，已发现DMHF在PMMA膜中的激发态动力学与溶液中的激发态动力学有很大不同。

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