Lanthanoiden‐Komplexe, IV. Alkyl‐und Donor‐substituierte Cyclopentadienyl‐Komplexe des Neodyms

Complexes of the Lanthanides, IV¹. — Alkyl‐and Donor‐substituted Cyclopentadienyl Complexes of Neodymium Neodymium trichloride reacts with the potassium salt K(DoCH₂CH₂Cp) (2c, DoOMe; 2d, DoNMe₂) 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.