ORGANOMETALLIC COMPOUNDS OF THE LANTHANOIDS .89. CYCLOOCTATETRAENYL COMPLEXES OF THE EARLY TRANSITION-METALS AND LANTHANOIDS .6. [N,N'-BIS(TRIMETHYLSILYL)BENZAMIDINATO]PHOSHINATO] AND NYL)(DIPHENYLBIS(TRIMETHYLSILYLIMIDO)-PHOSPHINATO] COMPLEXES OF THE RARE-EARTHS - X-RAY STRUCTURAL-ANALYSES OF (C8H8)TM[PHC(NSIME(3))(2)](THF), (C8H8)LU[4-MEOC(6)H(4)C(NSIME(3))(2)](THF), AND

[(C8H8)Ln(mu-Cl) (THF)(2)](2) or [(C8H8)Ln(mu-O3SCF3) (THF)(2)](2) (Ln = Y, Ce, Pr, Nd, Sm, Tm, Lu) react with Na[4RC(6)H(4)C(NSiMe(3))(2)] (R = H, OMe, CF,) or Li[PhC(NSiMe(3))(2)] to give the monomeric (cyclo octatetraenyl)lanthanide benzamidinates (C8H8)Ln[4-RC(6)H(4)C(NSiMe(3) )(2)] (THF) [R = H, Ln = Y (1), Ce (4), Pr (6), Nd (8), Sm (10), Tm (1 2), Lu (15); R = OMe, Ln = Y (2), Ce (5), Pr (7), Nd (9), Sm (11), Tm (13), Lu (16); R = CF3, Ln = Y (3), Tm (14), Lu (17)]. The reaction of [(C8H8)Ln(mu-Cl)(THF)(2)](2) (Ln = Ce, Pr, Nd, Sm) with Li[Ph(2)P(NSi Me(3))(2)] in THF leads directly to the monomeric compounds (C8H8)Ln[P h(2)P(NSiMe(3))(2)](THP) [Ln = Ce (18), Pr (19), Nd (20), Sm (21)] in good yields. The H-1-, C-13-, P-31- and Si-29-NMR and mass spectra of the new compounds as well as the molecular structures of 12, 16, and 2 0 are discussed. The Raman spectra of the complexes 1-3, 12, and 14-17 have been studied in detail.