摘要
Of all the lanthanides. only cerium forms stable tetravalent compounds.The tetra（cyclopentadienyl） cerium has been reported to be even stable enough to with-stand dilute acid solution.The IR spectrum of the compound contains a band at 2980 cm-1, in addition to the usual C-H stretching vibrations of cyclopentadienyl groups, which is considered as an evidence that Cp ring may be more covalently bonded to the Ce atom.
基金
Project supported by the Science Fund of Academia Sinica
