Ligands, complexes and their use for the polymerization of olefins

A process for the emulsion polymerization or emulsion copolymerization of ethylene or other 1-olefins and, optionally, other non-1-olefins in the presence of a complex of formula I:

• where the variables are defined as follows:
• M is an element of Groups 6 to 10 of the Periodic Table of the Elements,
• Nu1 is selected from the group consisting of O, S and Se;
• Nu2, Nu3 are selected from the group consisting of N and P,
• A1 is N or C—R7 or Si—R7,
• A2 is N or C—R8 or Si—R8,
• R1 to R9 are selected from the group consisting of (i) hydrogen, (ii) substituted or unsubstituted C1–C8-alkyl, (iii) substituted or unsubstituted C2–C8-alkenyl having from one to 4 isolated or conjugated double bonds, (iv) substituted or unsubstituted C3–C12-cycloalkyl, (v) C7–C13-aralkyl, (vi) C6–C14-aryl that is unsubstituted or monosubstituted or polysubstituted by identical or different substituents selected from the group consisting of substituted or unsubstituted C1–C8-alkyl, C3–C12-cycloalkyl, C7–C13-aralkyl, C6–C14-aryl, halogen, substituted or unsubstituted C1–C6-alkoxy, C6–C14-aryloxy, SiR10R11R12 and O—SiR10R11R12;
• and (vii) five- and six-membered nitrogen-containing heteroaryl radicals, unsubstituted or monosubstituted or polysubstituted by identical or different substituents selected from the group consisting of substituted or unsubstituted C1–C8-alkyl, C3–C12-cycloalkyl, C7–C13-aralkyl, C6–C14-aryl, halogen, C1–C6-alkoxy, C6–C14-aryloxy, SiR10R11R12 and O—SiR10R11R2, where adjacent radicals R1 to R9 are optionally joined to one another to form a 5- to 12-membered ring;
• L1 is an uncharged organic or inorganic ligand,
• L2 is an organic or inorganic anionic ligand, where L1 and L2 may be joined to one another by one or more covalent bonds, and
• z is an integer from 1 to 3, and where R10 to R12 are identical or different and are selected from among the group consisting of hydrogen, C1–C8-alkyl, C3–C12-cycloalkyl, C7–C13-aralkyl and C6–C14-aryl.