Abstract:

The title complex Co(bzacen)(bzacen=N,N′-dibenzoylactoneethylenediamine) was prepared and characterized by X-ray diffraction analysis and elemental analysis. In the solid state, the cobalt complex crystallized in monoclinic system, with space group P21/c, a=1.7297(9) nm, b=0.7148(4) nm, c=2.1099(12) nm, β=110.752(2)°, V=1.83807(13) nm3, D_x=1.465 Mg/m3, Z=4, μ=0.090 mm^-1, F(000)=844, S=1.01. The structure was refined to R1=0.030 and wR₂=0.074 for the observed 3103 reflections with I＞2σ(I). The Co atom lies in a slightly distorted square-planar geometry composed of two coordinating nitrogen atoms and two coordinating oxygen atoms. The complex was investigated as precursor for butadiene polymerization, and it showed high activity and high cis-1,4 selectivity when activated by cocatalyst Al₂Et₂Cl₃ or AlEt₂Cl.

Key words: cobalt complex, Schiff base, butadiene, polymerization.