Patent ID: 7399874

Claim:
A compound represented by the formula: wherein: M is a Group 3 to 12 transition metal; each R a is, independently, selected from the group consisting of chloride, bromide, fluoride, iodide, and C1 to C30 hydrocarbyls; each of R 1 , R 2 , R 3 , R 4 , R 5 , R 7 , R 8 , R 9 , R 10 , and R 11 is, independently a hydrogen, a hydrocarbyl group, a substituted hydrocarbyl group or halogen; R 6 is hydrogen, a hydrocarbyl group, or a substituted hydrocarbyl group; x is 1, 2, 3 or 4; and each Z is, independently, a group 15 atom.