Department of Chemistry, Faculty of Science and Agriculture, University of Fort Hare, PMB X1314, Alice 5700, South Africa.
Molecules. 2011 Sep 30;16(10):8353-67. doi: 10.3390/molecules16108353.
In this work, two ligands: 4-(trans-2-Methyl-2-butenoic acid)-2,2'-bipyridine) (L(1)) and 5-(trans-2-methyl-2-butenoic acid)-1,10-phenanthroline (L(2)), with the corresponding mixed-ligand heteroleptic Ru(II) complex were synthesized and characterized by FT-IR, 1H-, 13C-NMR spectroscopy and elemental analysis. The influence of the mixed functionalized polypyridyl ruthenium(II) complex on the photophysical and electrochemical properties were investigated and compared to individual single-ligand homoleptic complexes. Interestingly, the mixed-ligand complex formulated as [RuL(1)L(2)(NCS)(2)] exhibits broad and intense metal-to-ligand charge transfer (MLCT) absorption with a high molar extinction coefficient (λ(max) = 514 nm, ε = 69,700 M(-1) cm(-1)), better than those of individual single-ligand complexes, [Ru(L(1))(2)(NCS)(2)] and [Ru(L(2))(2)(NCS)(2)], and a strong photoluminescence intensity ratio in the red region at λ(em) = 686 nm. The electrochemical properties of the complex indicated that the redox processes are ligand-based.
在这项工作中，合成并通过傅里叶变换红外光谱（FT-IR）、1H-NMR、13C-NMR 光谱和元素分析对两种配体：4-（反式-2-甲基-2-丁烯酸）-2,2'-联吡啶）（L(1)）和 5-（反式-2-甲基-2-丁烯酸）-1,10-菲咯啉（L(2)）以及相应的混合配体异核钌（II）配合物进行了表征。研究了混合功能化多吡啶钌（II）配合物对光物理和电化学性质的影响，并与单个单配体同核配合物进行了比较。有趣的是，混合配体配合物的分子式为[RuL(1)L(2)(NCS)(2)]，具有宽而强的金属-配体电荷转移（MLCT）吸收，摩尔消光系数高（λ(max) = 514nm，ε = 69700M(-1)cm(-1)），优于单个单配体配合物[Ru(L(1))(2)(NCS)(2)]和[Ru(L(2))(2)(NCS)(2)]，并且在λ(em) = 686nm 处的红色区域具有较强的荧光强度比。配合物的电化学性质表明，氧化还原过程是基于配体的。
