H. Schumann et al., ORGANOMETALLIC COMPOUNDS OF THE LANTHANOIDS .79. SI)2N)2SM(MU-(ETA(8)-ETA(8)-C8H8))-SM(N(SIME3)2)2] - AN INVERSE ORGANOLANTHANOID SANDWICH COMPLEX, Angewandte Chemie, International Edition in English, 32(8), 1993, pp. 1208-1210
Two amidosamarium units sandwich the planar cyclooctatetraene (cot) li
gand in the title compound 1; this compound, the first example of an i
nverse-sandwich complex with a 4f metal, is accessible from [(cot)Sm(m
u-Cl)(thf)2] and the appropriate sodium amide. Analogous reactions wit
h Y, Gd, Er, and Lu compounds lead only to half-sandwich complexes.