M. Dolg et P. Fulde, RELATIVISTIC AND ELECTRON-CORRELATION EFFECTS IN THE GROUND-STATES OFLANTHANOCENES AND ACTINOCENES, Chemistry, 4(2), 1998, pp. 200-204
The sandwich complex [Ce(C8H8)(2)] has conclusively been shown to be a
bis([8]annulene)cerium(III) complex by theoretical as well as experim
ental investigations. Its electronic ground state can only be understo
od by taking electron correlations into account. Fundamental differenc
es between lanthanocenes and actinocenes as well as their anions resul
t mainly from the greater effect of relativistic effects in the heavie
r actinide systems.