linguistic:translation
Organoberkelium compounds

Berkelium forms a trigonal (η –C H) Bk metallocene complex with three cyclopentadienyl rings, which can be synthesized by reacting berkelium(III) chloride with the molten beryllocene (Be(C H)) at about 70 °C. It has an amber color and a density of 2.47 g/cm. The complex is stable to heating to at least 250 °C, and sublimates without melting at about 350 °C. The high radioactivity of berkelium gradually destroys the compound (within a period of weeks). One cyclopentadienyl ring in (η –C H) Bk can be substituted by chlorine to yield. The optical absorption spectra of this compound are very similar to those of (η –C H) Bk.