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一、前言 铈是唯一形成稳定的四价化合物的元素。四茂铈是在稀酸中也很稳定的化合物。根据红外光谱等实验数据,通常认为茂环和四价铈之间的化学键具有较强的共价性。
I. Introduction Ce is the only element that forms stable tetravalent compounds. Ceracene is also a very stable compound in dilute acids. According to the infrared spectroscopy and other experimental data, it is generally considered that the chemical bond between the ring of the metallocene and the tetravalent cerium has strong covalence.