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本工作合成了轻稀土氯化物与题目不饱和冠醚所形成的三种新的轻稀土配合物。元素分析数据说明稀土氯化物与配体的化学配比是1:1。我们着重对这些配合物进行了X射线光电子能谱研究,得到了组成原子芯能级电子(Ln 3d_(5/2),O 1s,C 1s,Cl 2p)的结合能变化信息。在LnCl_3·L和LnCl_3中观察到Ln 3d_(5/2)[Ln=Ce(Ⅲ),Pr(Ⅲ),Sm(Ⅲ)]的伴峰结构,其伴峰能前者分别为3.8和-4.2eV,后者为3.9,-4.5和-3.1eV。这是由于Cl 3p→Ln 4f电荷转移跃迁所引起的,铈属于“振起”(Shake-up)过程,镨和钐属于“振落”(Shake-down)过程。
This work synthesized three light rare earth complexes of light rare earth chloride with the title unsaturated crown ether. Elemental analysis data shows that the stoichiometric ratio of rare earth chloride to ligand is 1: 1. We focused on the X-ray photoelectron spectroscopy studies of these complexes and obtained the binding energy changes of the core-level electrons (Ln 3d_ (5/2), O 1s, C 1s, Cl 2p). The peak structures of Ln 3d_ (5/2) [Ln = Ce (Ⅲ), Pr (Ⅲ) and Sm (Ⅲ)] were observed in LnCl_3 · L and LnCl_3 with the peak energies of 3.8 and -4.2 eV, the latter being 3.9, -4.5 and -3.1 eV. This is due to the charge transfer transition of Cl 3p → Ln 4f, cerium to the “Shake-up” process, and praseodymium and samarium to the “Shake-down” process.