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Acta Cryst. (2013). E69, m654
[ doi:10.1107/S1600536813030328 ]

Tetra­chlorido­[N2,N2'-(di­methyl­silanedi­yl)bis­(N-tert-butyl-3-methyl­benzimid­amid­ato)-[kappa]2N2,N2']hafnium(IV)

T. Wang, J.-P. Zhao and S.-D. Bai

Abstract: The symmetric title mol­ecule, [Hf(C26H40N4Si)Cl4], lies about a twofold rotation axis. The HfIV and Si atoms lie on the rotation axis with all other atoms being in general positions. The HfIV atom is six-coordinated by two N atoms from the N2,N2'-(di­methyl­silanedi­yl)bis­(N-tert-butyl-3-methyl­benz­imid­amidate) ligand and four Cl- ions in a slightly distorted octa­hedral geometry. The two amidinate moieties are connected through the central Si atom with Si-N bond length of 1.762 (3) Å, generating the characteristic N-C-N-Si-N-C-N skeleton of a silyl-linked ansa-bis­(amidine) species.


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