Single site catalyst systems having a scorpion-like structure

A tridentate catalyst component of formula IV

• wherein R1, R2, R3, R4, R5, R6, R7, R8, R9 and R10 are each independently selected from hydrogen, unsubstituted or substituted hydrocarbyl, or insert functional group and two or more groups can be linked together to form further ring or rings, with the restriction that R1 and R3, R2 and R4, and R9 and R10, cannot be simultaneously oxazoline, and
• wherein Z is selected from groups 15 or 16 of the Periodic Table and m is the valence of Z minus one,
• wherein M is a metal Group 3 to 10 of the Periodic Table,
• wherein X′ are the same or different and are halogen or substituted or unsubstituted hydrocarbyl;
• and wherein n is the valence of M and
• characterised in that M is linked to three atoms.