Femtosecond Ultraviolet-Visible Fluorescence Study of the Excited-State Proton-Transfer Reaction of 7-Azaindole Dimer
Femtosecond Ultraviolet-Visible Fluorescence Study of the Excited-State Proton-Transfer Reaction of 7-Azaindole Dimer
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DOI：
10.1021/jp982522v
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发表时间：
1998-09
影响因子：
2.9
通讯作者：
S. Takeuchi;T. Tahara
中科院分区：
文献类型：
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作者：
S. Takeuchi;T. Tahara
用飞秒荧光上转换法研究了7-氮杂环己烷二聚体在正己烷中的激发态质子转移反应动力学。时间分辨测量在从近紫外到可见光(320−620 nm)的宽荧光波长范围内进行。除了共存单体的荧光外，还观察到了二聚体的三种荧光成分。还进行了时间分辨荧光各向异性测量，结果表明，二聚体产生的第一个荧光分量(τ=0.2ps)和第二个荧光分量(τ=1.1ps)来自两个具有不同跃迁矩方向的二聚体激发态。第二组分的衰减与第三组分的上升一致，这归因于质子转移反应形成的互变异构激发态(τ=3.2 ns)的荧光。从时间分辨荧光光谱中重建了这三个激发态的荧光光谱。
The dynamics of the excited-state proton-transfer reaction of 7-azaindole dimer has been investigated in hexane with use of the femtosecond fluorescence up-conversion method. Time-resolved measurements were performed in a wide fluorescence wavelength region from near-ultraviolet to visible (320−620 nm). Three fluorescence components due to the dimer were observed in addition to the fluorescence from coexisting monomer. Time-resolved fluorescence anisotropy measurements were also carried out, and the result indicated that the first (τ = 0.2 ps) and the second (τ = 1.1 ps) fluorescence components due to the dimer arise from two different dimeric excited states having different transition moment directions. The decay of the second component agrees with the rise of the third component, which is attributable to the fluorescence from the tautomeric excited state (τ = 3.2 ns) formed by the proton-transfer reaction. The fluorescence spectra of these three excited states were reconstructed from time-resolved fluor...