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Synthesis of new palladium(II) (1), nickel(II) (2a and 2b), and cobalt(II) (3) complexes bearing the unsymmetrical, bidentate nitrogen ligand 2,6‐bis(1‐methylethyl)‐N‐(2‐pyridinylmethylene)phenylamine (L) is described. The solid‐state structures of 1, 2a, and 2b have been determined by single‐crystal X‐ray diffraction. The PdII compound exists in the monomeric form whereas the nickel complexes were observed as centrosymmetric dimers with slightly distorted square‐pyramidal coordination sphere around each nickel center.

SUMMARY: Three pyridylimine based complexes of Ni II and Co II were reacted with methylaluminoxane (MAO) and tested as catalysts in ethylene polymerization. The two nickel catalysts produced mainly methyl branched polymers with good to moderate activity, while the cobalt compound showed only marginal activity. Reaction conditions strongly affect the polymer properties, such as molecular weight, melting temperature, degree of branching, and chain end unsaturation type.

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