Polyelectrochromism and electronic coupling in vinylruthenium-modified carbazoles
作者:Obadah S. Abdel-Rahman、Muhammad T. Jan、Steffen Oßwald、Rainer F. Winter
DOI:10.1016/j.jorganchem.2017.05.010
日期:2017.11
Ru(CO)Cl(PiPr3)2(CHCH-)} entities were prepared by the regio- and stereospecific insertion of the hydride precursor HRu(CO)Cl(PiPr3)2 into the CC bond of the corresponding ethynylated N-substituted carbazoles. They were characterized by IR, UV/Vis, and NMR spectroscopy, electrochemistry, and, in up to four different oxidation states, by UV/Vis/NIR and IR spectroelectrochemistry. Their radical cations were additionally
六种咔唑衍生的单核,二核和三核钌配合物是由区域-和-区域制备的,这些复合物具有一到三个方锥,五配位的Ru(CO)Cl(P i Pr 3)2(CH CH-)}实体。氢化物前体HRu(CO)Cl(P i Pr 3)2的立体定向插入相应乙炔化N的C C键中取代咔唑。它们通过IR,UV / Vis和NMR光谱,电化学进行表征,并在多达四个不同的氧化态下通过UV / Vis / NIR和IR光谱电化学进行表征。通过EPR光谱进一步研究了它们的自由基阳离子。实验研究得到(TD-)DFT计算的补充。对这些配合物的电化学研究表明,有两到四个可逆的,连续的单电子氧化过程。半波电势分离Δ Ë ½个别氧化还原波和所导出的歧化常数之间ķ Ç表明中间氧化态对于歧化是足够稳定的,以在溶液中产生和研究。光谱数据表明,咔唑配体对每次氧化都有重要贡献,乙烯基钌部分明显参与了较低的氧化步骤。UV / Vis / NIR光谱