Neodym(III)komplexe mit stark raumerfüllenden Cyclopentadienyl- und Benzamidinat-Liganden: Ein Vergleich

Abstract

[Cp** 2Nd(μ-CI)] 2 ( 1) has been prepared by treatment of NdCI 3(THF) 2 with two equivalents of KCp** (Cp** = 1,3-di-t-butylcyclopentadienyl). Similarly, Li[(CF) 3) 3C 6H 2C(NSiMe 3) 2] reacts with NdCl 3(THF) 2 to give [(CF 3) 3C 6H 2C(NSiMe 3) 2] 2Nd(μ-Cl) 2Li(THF) 2 ( 2). Recrystallization of 2 from DME/hexane yields the binuclear derivative (μ-DME)[{(CF 3) 3C 6H 2C(NSiMe 3) 2} 2Nd(μ-Cl) 2Li(THF)] 2 ( 3). The molecular structures of 1, 2 and 3 have been determined by X-ray diffraction. The 2,4,6-trisub- stituted benzamidinate anion [(CF 3) 3C 6H 2C(NSiMe 3) 2] − can be regarded as a steric equivalent of bulky cyclopentadienyl ligands such as Cp* or Cp**.