Patent ID: 6872844

Claim:
A metal complex corresponding to the formula: CpM(ZY)L (I), where Cp is a neutral or anionic ligand group containing at least on cyclic group containing delocalized π-electrons, by means of which Cp is bonded to M; M is a Group 4 metal of the Periodic Table of the Elements; ZY is a linking group with Z bonded to Cp and Y bonded to M, and wherein Z is SiR 6 2 , CR 6 2 , SiR 6 2 SiR 6 2 , CR 6 2 CR 6 2 , CR 6 ═CR 6 , CR 6 2 SiR 6 2 , BR 6 , BR 6 L″, SnR 6 , or GeR 6 2 , and Y is —O—, —S—, —NR 5 —, —PR 5 —; —NR 5 2 , or —PR 5 2 ; R 5 , independently each occurrence, is hydrocarbyl, trihydrocarbylsilyl, or trihydrocarbylsilylhydrocarbyl, said R 5 having up to 20 atoms not counting hydrogen, and optionally two R 5 groups together with the remainder of Y form a ring system; R 6 , independently each occurrence, is hydrogen, or a member selected from hydrocarbyl, hydrocarbyloxy, silyl, halogenated alkyl, halogenated aryl, —NR 7 2 , and combinations thereof, said R 6 having up to 20 atoms not counting hydrogen, and optionally, one or more R 6 groups together with the remainder of Z form a ring system; R 7 independently each occurrence is hydrocarbyl or two R 7 groups together with N form a ring system, said R 7 having up to 10 atoms not counting hydrogen; L″ is a monodentate or polydentate Lewis base optionally bonded to R 6 ; and L is acetylene, or a mono- or di-substituted derivative of acetylene.