Using the HETPHEN approach, five new heteroleptic copper(I) complexes composed of a push–pull 4,4′-styryl-6,6′-dimethyl-2,2′-bipyridine ligand and a bulky bis[(2-diphenylphosphino)phenyl]-ether (DPEphos) or a bis2,9-mesityl phenanthroline (Mes2Phen) were prepared and characterized by electronic absorption spectroscopy, electrochemistry, and TD-DFT calculations. These complexes exhibit very intense absorption bands in the visible region with extinction coefficient in the range of 5–7 × 104 M−1 cm−1. The analysis of the position, intensity and band shape indicates a strong contribution from an intra-ligand charge-transfer transition centered on the styrylbipyridine ligand along with MLCT transitions. These new complexes experimentally demonstrate that good light harvesting properties with bis-diimine copper(I) complexes are a reality if one chooses suitable ligands in the coordination sphere. This constitutes a milestone towards using bis-diimine copper(I) complexes for solar energy conversion (artificial photosynthesis and solar cells).
利用 HETPHEN 方法,通过电子吸收光谱和电
化学分析以及 TD-DFT 计算,制备了由推挽式 4,4′-
苯乙烯-
6,6′-二甲基-2,2′-联吡啶配体和大块双[(2-
二苯基膦)苯基]醚 (DPEphos) 或双 2、
9-甲基菲罗啉(Mes2Phen),并通过电子吸收光谱、电
化学和 TD-DFT 计算对其进行了表征。这些复合物在可见光区域表现出非常强烈的吸收带,消光系数在 5-7 × 104 M-1 cm-1 之间。对位置、强度和带形的分析表明,以
苯乙烯联
吡啶配体为中心的
配体内电荷转移转变以及 MLCT 转变对吸收带的贡献很大。这些新的配合物通过实验证明,如果在配位圈中选择合适的
配体,双二胺
铜(I)配合物具有良好的光收集特性是现实存在的。这是将双二胺
铜(I)配合物用于太阳能转换(人工光合作用和太阳能电池)的一个里程碑。