Reaction and crystal structures of 1,3-bis(trimethylsilyl)-2-t-butyl-aza-allyl-lithium with iron(II), cobalt(II), nickel(II), titanium(IV)

Aza-allyl lithium [LiN(R)C(Bu-t)CHR](2) (R = SiMe3) reacted with NiCl2 or TICl4 to produce a coupling meso-compound [N(SiMe3)C(Bu-t)CH(SiMe3)], (1), or with CoCl2, FeCl2 (mole ratio 2:1) to produce complex 1,3-bis (trimethylsilyl)-2-t-butyl-aza-allyl cobalt(II) (2) and 1,3-bis(trimethylsilyl)-2-t-butyl-aza-allyl iron(II) (3) respectively. Compounds 1, 2 and 3 were characterized by elemental analysis, H-1 and C-13 NMR spectra and X-ray single crystal diffraction. The results show that the compound 1 belongs to the triclinic space group P (1) over bar. A centro-symmetric dimer aggregation is observed with the two moiety positioned in trans manner. The complex 2 belongs to the monoclinic. space group C2/c. The molecular structure of 2 is rigorous centro-symmetry. The six coordination atoms of two 1-aza-allyl ligands organize the distorted octahedral field of central cobalt atom. The structure of 3 is similar to complex 2. CCDC: 219193, 1; 219194, 2; 219195, 3.