ИСТИНА

This invention relates to metallocene compds. represented by formula (I)​: wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; E is an indenyl ligand that is substituted in any position of the indenyl ligand with at least one arom. heterocyclic substituent or pseudoarom. heterocyclic substituent that is bonded to the indenyl ring through a nitrogen or phosphorous ring heteroatom; Y is an optional bridging group that is bonded to E and A, and is present when y is one and absent when y is zero; y is zero or one; X are, independently, univalent anionic ligands. The E in formula I may be substituted with 0, 1, 2, 3, 4, 5 or 6 R groups, where each R is, independently, a hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, substituted silylcarbyl, germylcarbyl, or substituted germylcarbyl substituent, and optionally, two or more adjacent R substituents may join together to form a substituted or unsubstituted, satd., partially unsatd., or arom. cyclic or polycyclic substituent; A is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted fluorenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or other mono-​anionic ligand, or A may, independently, be defined as E. This invention further relates to a catalyst system comprised of the above metallocenes (e.g., bis(η5-​2-​(pyrrol-​1-​yl)​indenyl)​zirconium dichloride) combined with an activator (e.g., MAO)​, and to a process to polymerize unsatd. monomers (e.g., ethylene and 1-​octene) using such catalyst system.