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首页> 美国政府科技报告 >Picosecond Dynamics of Solvation: Time-Resolved Fluorescence of 4-Aminophthalimide in Solution
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Picosecond Dynamics of Solvation: Time-Resolved Fluorescence of 4-Aminophthalimide in Solution

机译：皮秒的溶剂化动力学：溶液中4-氨基邻苯二甲酰亚胺的时间分辨荧光

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The following chapters describe the application of picosecond fluorescence techniques to the study of the dynamics of solvation. The excited state of the molecule 4-aminophthalimide (4AP) has larger dipole moment than the ground state. Following electronic excitation of the 4AP solute, a polar solvent rearranges around the newly created solute dipole moment. As the solvent rearranges, the fluorescence of the 4AP molecules red shifts. By temporally resolving this red shift in fluorescence, the dynamics of solvation of the 4AP molecules are directly probed. The fluorescence red shift of 4AP is examined in pure solvents as well as a mixed solvent of 1-propanol:toluene. The only pure solvents that cause an observable, time-dependent red shift in the fluorescence of 4AP are the alcohols. For each alcohol, the solvation times measured from the time of the red shifts of fluorescence are found to be well correlated with the dielectric relaxation times of the solvent. This result explains the absence of a time-dependent red shift in the other solvents; the dielectric relaxation times of all other solvents are faster than the time resolution of the instrumentation. 58 refs., 44 figs., 22 tabs. (ERA citation 11:051535)

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