Patent ID: 8546595

Claim:
A metallocene compound represented by the formula (1): AMX n-1 M is a transition metal atom having a coordination number of n selected from Group 3, 4, 5 or 6 of the Periodic Table of Elements, or a lanthanide metal atom, or actinide metal atom; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp 2 carbon atom at a bondable ring position of the ligand, wherein said ligand also includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.