Bis(2-butyl-N,N′-diisopropylamidinato)dichlorohafnium(IV)

Abstract

The title compound, [Hf(C11H23N2)2Cl(2)], is a monomeric hafnium(IV) complex containing two bidentate amidinate ligands and two cis Cl atoms. The crystals are triclinic (space group P-1) and there is one independent six-coordinate monomer with a highly distorted octahedral geometry in the asymmetric unit. The reported structure is the first hafnium-amidinate complex to be characterized successfully by single-crystal X-ray diffraction.

Dichloridobis{N-[(dimethylamino)dimethylsilyl]-2,6-dimethylanilido-κ2N,N′}hafnium(IV)

“…The corresponding N1-Si1-N2 angle 92.40 (18)° of the ligand is constrained nearly to be a right angle. The two values are quite different from those in the related amidinate and guanidinate hafnium(IV) compounds bearing the same geometry (Wood et al, 1999;Milanov et al, 2005), N-Hf-N being about 60° and N-C-N being larger than 110°. The Hf-N anilido (Hf-N1) bond is 2.100 (4)Å whereas the Hf--N amino (Hf-N2) bond is 2.397 (4)Å in the title compound.…”