Wu Si-Hai, Zhang Zhe, Zheng Ren-Hui, Yang Rong, Wang Lianhui, Shao Jiang-Yang, Gong Zhong-Liang, Zhong Yu-Wu
School of Medicine, Huaqiao University, Quanzhou 362021, China.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Materials (Basel). 2023 Oct 20;16(20):6792. doi: 10.3390/ma16206792.
Three monoruthenium complexes (PF)-(PF) bearing an N(CH)-bridged ligand have been synthesized and characterized. These complexes have a general formula of Ru(bpy)(), where is a 2,5-di(-methyl-'-(pyrid-2-yl)amino)pyrazine (dapz) derivative with various substituents, and bpy is 2,2'-bipyridine. The photophysical and electrochemical properties of these compounds have been examined. The solid-state structure of complex (PF) is studied by single-crystal X-ray analysis. These complexes show two well-separated emission bands centered at 451 and 646 nm (Δ = 195 nm) for (PF), 465 and 627 nm (Δ = 162 nm) for (PF), and 455 and 608 nm (Δ = 153 nm) for (PF) in dilute acetonitrile solution, respectively. The emission maxima of the higher-energy emission bands of these complexes are similar, while the lower-energy emission bands are dependent on the electronic nature of substituents. These complexes display two consecutive redox couples owing to the stepwise oxidation of the N(CH)-bridged ligand and ruthenium component. Moreover, these experimental observations are analyzed by computational investigation.
已合成并表征了三种带有N(CH)-桥连配体的单钌配合物(PF)-(PF)。这些配合物的通式为Ru(bpy)()，其中是具有各种取代基的2,5-二(-甲基-'-吡啶-2-基)氨基吡嗪(dapz)衍生物，bpy是2,2'-联吡啶。已研究了这些化合物的光物理和电化学性质。通过单晶X射线分析研究了配合物(PF)的固态结构。在稀乙腈溶液中，这些配合物分别在451和646 nm(Δ = 195 nm)处显示两个分离良好的发射带，(PF)在465和627 nm(Δ = 162 nm)处，(PF)在455和608 nm(Δ = 153 nm)处。这些配合物高能发射带的发射最大值相似，而低能发射带则取决于取代基的电子性质。由于N(CH)-桥连配体和钌组分的逐步氧化，这些配合物显示出两个连续的氧化还原对。此外，通过计算研究对这些实验观察结果进行了分析。
