Metallorganische Verbindungen der Lanthanoide, 89. Cyclooctatetraenyl‐Komplexe der frühen Übergangsmetalle und Lanthanoide, 6. (Cyclooctatetraenyl)[N,N′‐bis(trimethylsilyl)benzamidinato]‐und ‐[diphenylbis(trimethylsilylimido)phosphinato]‐Komplexe der Seltenen Erden; Röntgenstrukturanalyse von (C8H8)Tm[PhC(NSiMe3)2](THF), (C8H8)Lu[4‐MeOC6H4C(NSiMe3)2](THF) und (C8H8)Nd[Ph2P(NSiMe3)2](THF)

Organometallic Compounds of the Lanthanoids, 89. – Cyclooctatetraenyl Complexes of the Early Transition Metals and Lanthanoids, 6. – (Cyclooctatetraenyl)[N,N′‐bis(trimethylsilyl)benzamidinato]‐ and ‐[diphenylbis(trimethylsilylimido)‐phosphinato] Complexes of the Rare Earths; X‐Ray Structural Analyses of (C8H8)Tm[PhC(NSiMe3)2](THF), (C8H8)Lu[4‐MeOC6H4C(NSiMe3)2](THF), and (C8H8)Nd[Ph2P(NSiMe3)2](THF) [(C8H8)Ln(μ‐Cl)(THF)2]2 or [(C8H8)Ln(μ‐O3SCF3)(THF)2]2 (Ln = Y, Ce, Pr, Nd, Sm, Tm, Lu) react with Na[4‐RC6H4C(NSiMe3)2] (R = H, OMe, CF3) or Li[PhC(NSiMe3)2] to give the monomeric (cyclooctatetraenyl)lanthanide benzamidinates (C8H8)Ln[4‐RC6H4C(NSiMe3)2](THF) [R = H, Ln = Y (1), Ce (4), Pr (6), Nd (8), Sm (10), Tm (12), 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(μ‐Cl)(THF)2]2 (Ln = Ce, Pr, Nd, Sm) with Li[Ph2P(NSiMe3)2] in THF leads directly to the monomeric compounds (C8H8)Ln[Ph2P(NSiMe3)2](THF) [Ln = Ce (18), Pr (19), Nd (20), Sm (21)] in good yields. The 1H‐, 13C‐, 31P‐ and 29Si‐NMR and mass spectra of the new compounds as well as the molecular structures of 12, 16, and 20 are discussed. The Raman spectra of the complexes 1–3, 12, and 14–17 have been studied in detail.