Cyclooctatetraenyl-komplexe der frühen übergangsmetalle und lanthanoide
摘要:
The dimeric complexes [(COT)Ln(mu-O3SCF3)(THF)2]2 (Ln = Ce (1), Pr (2), Nd (3), Sm (4)) are easily prepared by treatment of anhydrous lanthanide(III) triflates with equimolar amounts of K2COT (COT = eta8-cyclooctatetraenyl(2-)). The reaction of lanthanide triiodides with K2COT affords monomeric complexes of the type (COT)Ln(I) (THF)3 (Ln = Nd (5), Sm (6)). Due to their increased solubility in polar organic solvents these new precursors offer preparative advantages over the previously used chloro derivatives [(COT)Ln(mu-Cl)(THF)2]2. The molecular structures of 3 and 5 have been determined by X-ray diffraction.