Wolff T, Weber S, Böhm B, Schütz A
Technische Universität Dresden, Institut für Physikalische Chemie, Germany.
Photochem Photobiol. 1995 Jul;62(1):82-6. doi: 10.1111/j.1751-1097.1995.tb05242.x.
After UV irradiation of rapidly frozen solutions of N,N,N',N'-tetramethylbenzidine (TMB) in dilute aqueous micellar cetyltrimethylammonium bromide at 80 K, the ESR signal corresponding to the TMB+ cation was detected indicating photoionization. This signal was monitored as a function of time at various temperatures between 80 K and 260 K. On a timescale of a few days the signal decayed to a plateau value that was stable for months. Two distinct second-order processes for the decay from the initial to the plateau value were observed: one prevailing at low temperatures with an activation energy of 0.6 kJ/mol, and one prevailing at T > 220 K with an activation energy of 13 kJ/mol. By means of spin probe investigations the latter process was shown to be connected with a local softening of the region adjacent to the micellar surface.
在80K下，对稀水胶束十六烷基三甲基溴化铵中N，N，N'，N'-四甲基联苯胺（TMB）的快速冷冻溶液进行紫外线照射后，检测到对应于TMB +阳离子的ESR信号，表明发生了光电离。在80K至260K之间的不同温度下，将该信号作为时间的函数进行监测。在几天的时间尺度上，信号衰减至一个稳定数月的平稳值。观察到从初始值到平稳值衰减的两个不同的二级过程：一个在低温下占主导，活化能为0.6kJ/mol，另一个在T>220K时占主导，活化能为13kJ/mol。通过自旋探针研究表明，后一个过程与胶束表面相邻区域的局部软化有关。
