Abstract
The reaction of the metallic europium and ytterbium in liquid ammonia with cyclopentadiene yielded yellow, paramagnetic (7.6 B.M.) dicyclopentadienyleuropium and red, diamagnetic dicyclopentadienyl-ytterbium. These are the first organometallic derivatives of divalent lanthanides. The chemical properties and infrared spectra of the ionic sandwich compounds are similar to those of Sr(C3H5)3 and Ca(C5H5)2. The tricyclopentadienyl derivatives of terbium, holmium, thulium and lutetium were prepared using an improved method, by reaction of the metal chloride with an alkali metal cyclopentadienyl in diethyl ether or benzene. The melting points, susceptibilities and infrared spectra of these compounds are presented and the 1H NMR spectrum of the diamagnetic Lu(C3H5)3 is described.
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