The ()− ion in samarium cyclopentadienides can be replaced by the indenide ()− or cyclooctatetraenide ()2− ring, resulting in or . The latter compound has a structure similar to uranocene. There is also a cyclopentadienide of divalent samarium, a solid that sublimates at about . Contrary to ferrocene, the rings in are not parallel but are tilted by 40°.
the ()− ion in SAMarium cYclopentAdIEniDeS Can be RePlaCed By the InDEnide ()− Or cyCLoOCtatetrAenIDe ()2− rInG, resuLting IN or . tHe latter compoUnd has a sTRucture SimiLar to uRanOcenE. there is also a cyclOpeNtADiEniDE of diValent SAMARium, a SolId tHat sublImaTEs at AboUt . conTRaRy To ferroCENe, the Rings iN aRE noT ParAlleL bUt are tiLteD by 40°.