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Abstract

The present invention relates to compounds of formula (I) wherein each of X, Y, Z is independently selected from O, S, NR.sup.1, CR.sup.2R.sup.3, N and CR.sup.4, and where optionally X--Y, Y-Z, Z-E.sup.1 and X-E.sup.2 each independently form part of a saturated or unsaturated ring system which may be substituted or unsubstituted; m is 0 or 1; M is a metal selected from Ti[III], Ti[IV], Fe[II], Fe[III], Co[I], Co[II], Co[III], Ni[II], Cr[III], Mn[II], Mn[III], Mn[IV], Ru[II], Ru[III], Ru[IV], Pd[II], V[II], V[III], V[IV], V[V], Cu[I], Cu[II], Rh[I], Rh[III], Mo[III], Mo[V], Re[I] and Re[II]; each of E.sup.1 and E.sup.2 is independently selected from O, S, NR.sup.5, N, P, PR.sup.6, where at least one of either E.sup.1 or E.sup.2 carries a formal negative charge; L.sup.2 is a one electron donor ligand; n is zero or an integer such that the compound has an overall charge of zero or +1; L.sup.1 is NR.sup.7R.sup.B, PR.sup.7R.sup.B, OR.sup.7, SR.sup.7, O, S or NR.sup.16, imidazolyl, pyridinyl, benzimidazolyl or quinolinyl; each of R.sup.1-8 and R.sup.16 is independently H or a hydrocarbyl group; Q is a linker group; and r is 0 or 1. Further aspects of the invention relate to catalyst compositions comprising compounds of formula (I), and their use in the polymerisation of olefinically unsaturated monomers.

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First Claim