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The symmetric title mol­ecule, [Hf(C 26 H 40 N 4 Si)Cl 4 ], lies about a twofold rotation axis. The Hf IV  and Si atoms lie on the rotation axis with all other atoms being in general positions. The Hf IV  atom is six-coordinated by two N atoms from the  N   2 , N   2′ -(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.

acta crystallographica. section e

Tetrachlorido[N2,N2′-(dimethylsilanediyl)bis(N-tert-butyl-3-methylbenzimidamidato)-κ2N2,N2′]hafnium(IV)