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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Dynamics of Structural Relaxation of Stilbene 3 in Solution, Cetyltrimethylammonium Bromide Micelle, and Bis(2-ethylhexyl) Sulfosuccinate Reverse Micelle
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Dynamics of Structural Relaxation of Stilbene 3 in Solution, Cetyltrimethylammonium Bromide Micelle, and Bis(2-ethylhexyl) Sulfosuccinate Reverse Micelle

机译：溶液中Stilbene 3，十六烷基三甲基溴化铵胶束和双（2-乙基己基）磺基琥珀酸酯反胶束的结构弛豫动力学

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摘要

The relaxation dynamics of the excited states of stilbene 3 in various solvents, confined environment cetyltrimethylammonium bromide (CTAB) micelle, and water/ bis(2-ethylhexyl) sulfosuccinate (AOT)/hexane reverse micelle are investigated. In the time-resolved decay curves of fluorescence measured in solution at excitation wavelength 256 or 266 nm, stilbene 3 underwent initially an ultrafast internal conversion to the S2 state or was directly excited at the S2 then via a conformational relaxation with time constant 1.1 — 4.6 ps. This relaxation process displays a linear dependence on solvent viscosity. Slow relaxation in deuterated methanol and water is explained that the vibrational energy is efficiently coupled to the librational modes of solvent. The conformational relaxation rate decreases slightly in the CTAB micelle but is greatly hindered in the AOT reverse micelle with small cavities. According to the results of anisotropy measurements, in both CTAB and AOT reverse micelles with a cavity diameter as large as ~7 nm, the dynamics of molecular rotation remain significantly hindered.
机译：研究了二苯乙烯3在各种溶剂，密闭环境十六烷基三甲基溴化铵（CTAB）胶束和水/双（2-乙基己基）磺基琥珀酸酯（AOT）/己烷反胶束中激发态的弛豫动力学。在激发波长为256或266 nm的溶液中测得的荧光的时间分辨衰减曲线中，二苯乙烯3最初经历了超快内部转化为S2状态，或直接在S2处被激发，然后通过构象弛豫（时间常数为1.1 — 4.6） ps。该松弛过程显示出对溶剂粘度的线性依赖性。氘代甲醇和水中的缓慢弛豫可以解释为，振动能有效地与溶剂的释放模式耦合。在CTAB胶束中，构象弛豫速率略有降低，但在具有小腔的AOT反胶束中，构象弛豫速率却受到极大的阻碍。根据各向异性测量的结果，在CTAB和AOT反胶束中，腔直径高达〜7 nm，分子旋转的动力学仍然受到显着阻碍。

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