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Abstract

A complex of transition metal Ti, Fe, Co, Ni, Cr, Mn, Ta, Rh, Y, Sc, Ru, Pd, Zr, Hf, V or Nb and a mono-, bi-, tri-, or tetra-dentate ligand, wherein at least one of the donor atoms of the ligand is a nitrogen atom N with a 5-membered heterocyclic substituent joined to the N by a carbon atom. The complex is preferably Formula (I) wherein R.sup.5--N-G-X.sup.1 is a bi-, tri, or tetra-dentate ligand, N is joined to G by an imine linkage; G is a bridging group which can contain a third or fourth donor atom; X.sup.1 is --O or --S if the X.sup.1-M bond is covalent, or if the X.sup.1-M bond is dative X.sup.1 is .dbd.S, --PR.sup.7R.sup.8, --PR.sup.8R.sup.9, .dbd.NR.sup.7, .dbd.NR.sup.8, --NR.sup.7R.sup.8 or --NR.sup.8R.sup.9; R.sup.5 and R.sup.7 are 5-membered heterocyclic substituents joined to the nitrogen (or phosphorus) atoms via a carbon atom: R.sup.8 and R.sup.9 are hydrocarbyl or heterohydrocarbyl, substituted hydrocarbyl or aryl substituent; X represents an atom or group covalently or ionically bonded to the transition metal M: L is a group datively bound to M, and n is from 0 to 5; q is 1 or 2. The complexes find use as polymerisation catalysts, preferably with an activator, e.g. MAO ##STR00001##

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