Received 26 November 2011
In the title binuclear CoII complex, [Co2(C12H21N2Si)2Cl2], an inversion center is located at the mid-point between the two Co atoms in the dimeric molecule. The bidentate N-silylated anilide ligand coordinates the CoII atom in an N,N'-chelating mode and provides the anilide N atom as a bridge to link two CoII atoms. The two ends of the N-Si-N chelating unit exhibit different affinities for the metal atom. The Co-Nanilide bond is 2.031 (6) Å and Co-Namino bond is 2.214 (6) Å. The four-coordinate Co atom presents a distorted tetrahedral geometry, while the dimeric aggregation exhibits a (CoN)2 rhombus core with 1.998 (6) Å as the shortest sides and shows a ladder structure composed of Co, N and Si atoms.
For related reviews of metal amides, see: Holm et al. (1996); Kempe (2000). For catalytic applications of related N-silylated analido group 4 metal compounds towards olefin polymerization, see: Gibson et al. (1998); Hill & Hitchcock (2002); Yuan et al. (2010). For related organometallic compounds supported by analogous analido ligands, see: Schumann et al. (2000); Chen (2008, 2009). For related cobalt amides, see: Murray & Power (1984); Hope et al. (1985).
Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL/PC (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: JJ2112 ).
This work was sponsored by the Natural Science Foundation of China (20702029) and the Natural Science Foundation of Shanxi Province (2008011024).
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