NEODYMIUM(III) COMPLEXES WITH BULKY CYCLOPENTADIENYL AND BENZOAMIDINATE LIGANDS - COMPARISON

[Cp star star 2Nd(mu-Cl)]2 (1) has been prepared by treatment of NdCl3(THF)2 with two equivalents of KCp star star (Cp star star = 1,3-di-t-butylcyclopentadienyl). Similarly, Li[(CF3)3C6H2C(NSiMe3)2] reacts with NdCl3(THF)2 to give [(CF3)3C6H2C(NSiMe3)2]2Nd(mu-Cl)2Li(THF)2 (2). Recrystallization of 2 from DME/hexane yields the binuclear derivative (mu-DME)[{(CF3)3C6H2C(NSiMe3)2}2Nd(mu-Cl)2Li(THF)]2 (3). The molecular structures of 1, 2 and 3 have been determined by X-ray diffraction. The 2,4,6-trisubstituted benzamidinate anion [(CF3)3C6H2C(NSiMe3)2]- can be regarded as a steric equivalent of bulky cyclopentadienyl ligands such as Cp star or Cp star star.