Photoinduced electron-transfer reactions of micelle-forming surfactant ruthenium(II) bipyridyl derivatives
Photoinduced electron-transfer reactions of micelle-forming surfactant ruthenium(II) bipyridyl derivatives
复制标题
胶束形成表面活性剂钌(II)联吡啶衍生物的光致电子转移反应
DOI：
10.1039/f19898500349
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
W. Reed
中科院分区：
文献类型：
--
作者：
F. Torki;R. Schmehl;W. Reed
合成了一系列在一个联吡啶上含有一个或两个长烷基链的Ru(II)联吡啶衍生物。用表面张力法测定了络合物氯盐的临界胶束浓度，用静态光散射法测定了聚集数。此外，还考察了络合物的光物理性质与聚集度的关系。[(Bpy)_2Ru(L-L)_2+L-L=表面活性剂联吡啶]络合物的最大发射峰在胶束化后发生了约15 nm的红移。通过静态和动态发光测量，研究了[(Bpy)2Ru(MC17)2+(MC17=4-甲基-4‘-十七烷基-2-2’-联吡啶)]与甲基紫精(MV2+)的荧光猝灭。胶束络合物的猝灭至少比自由表面活性剂络合物的猝灭慢20倍。研究了[(bpy2Ru(MC17)]2+浓度对该络合物在牺牲电子供体EDTA存在下光还原MV2+的影响。测定了MV2+的光还原量子产率，并与相似条件下用[Ru(Bpy)3]2+得到的量子产率进行了比较。
A series of surfactant ruthenium(II) bipyridyl derivatives have been prepared having either one or two long alkyl chains on a single bipyridine. The critical micelle concentrations of the chloride salts of the complexes were determined using surface tensiometry, and aggregaton numbers were obtained from static light-scattering measurements. In addition, photophysical properties of the complexes were examined as a function of the degree of aggregation. The emission maximum for complexes of the type [(bpy)2 Ru(L-L]2+ L-L = surfactant bipyridine, exhibits a bathochromic shift of ca. 15 nm upon micellization. Luminescence quenching of one complex, [(bpy)2Ru(MC17)2+(MC17 = 4-methyl-4′-heptadecyl-2-2′-bipyridine), with methyl viologen (MV2+) was examined as a function of the surfactant complex concentration by both static and dynamic luminescence measurements. Quenching of micellized complex was found to be at least a factor of 20 slower than quenching of the free surfactant complex. The photoreduction of Mv2+ by the complex in the presence of a sacrificial electron donor, EDTA, was also examined as a function of the concentration of [(bpy2Ru(MC17)]2+. Quantum yields for MV2+ photoreduction were determined and compared with values obtained using [Ru(bpy)3]2+ under similar conditions.