Tri­chlorido­{meth­yl[4-(methyl­imino)­pent-2-en-2-yl]aza­nido-κ(2) N,N′}hafnium(IV)

The title complex, [Hf(C(29)H(41)N(2))Cl(3)], was synthesized from HfCl(4) and HC[C(Me)N((i)Pr(2)C(6)H(3))](2)Li(Et(2)O) in toluene. The structure is isotypic with those of Ti(IV) and Zr(IV) complexes reported previously [Nikiforov et al. (2007 ▶). Dalton Trans. pp. 4149–4159; Kakaliou et al. (1999 ▶). Inorg. Chem. 38, 5964–5977]. There is a crystallographic mirror plane containing the Hf atom, one chloride ligand and the central diketiminate C atom. The Hf(IV) ion has slightly distorted square-pyramidal geometry surrounded by two N atoms from the β-diketiminate ligand and by three Cl(−) anions. Coordination bond lengths are Hf—N = 2.181 (3) Å, and Hf—Cl = 2.3148 (15) and 2.3727 (12) Å.