Lanthanoiden-Komplexe. IV: Alkyl- und Donor-substituierte Cyclopentadienyl-Komplexe des Neodyms

Complexes of the Lanthanides, IV[1]. — Alkyl-and Donor-substituted Cyclopentadienyl Complexes of Neodymium Neodymium trichloride reacts with the potassium salt K(DoCH2CH2Cp) (2c, DoOMe; 2d, DoNMe2) of the functionalized cyclopentadienyls in THF to yield the sublimable homoleptic complexes Nd(DoCH2CH2Cp)3 (3c, d). Under the same conditions, K(iBuCp) (2a) yields the adduct Nd(i1-BuCp)3(THF) (3a′), which is obtained free of THF by thermal treatment. The silylamide route is applied to synthesize the homoleptic neopentylcyclopentadienyl derivative Nd-(NeopCp)3 (3b). The alkyl-substituted complexes, particularly the isobutyl derivative, show a remarkable volatility. The first solvent-free, monomeric complex of the type „LnCp2Cl”, namely Nd(Me2NCH2CH2Cp)2Cl (4), is obtained from NdCl3 and two equivalents of 2d.