A composition comprising a solid methyl aluminoxane support material and compound of the formula shown below: wherein R 1 and R 2 are each independently hydrogen or linear alkyl, or R 1 and R 2 are linked such that, when taken in combination with the atoms to which they are attached, they form a 6-membered fused aromatic ring optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, aryl, heteroaryl, carbocyclic and heterocyclic, wherein each aryl, heteroaryl, carbocyclic and heterocyclic group is optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, halo, amino, nitro, cyano, alkylamino, [ alkyl] 2 amino and -S 2 alkyl; R 3 and R 4 are each independently hydrogen or linear alkyl, or R 3 and R 4 are linked such that, when taken in combination with the atoms to which they are attached, they form a 6-membered fused aromatic ring optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, aryl, heteroaryl, carbocyclic and heterocyclic, wherein each aryl, heteroaryl, carbocyclic and heterocyclic group is optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, halo, amino, nitro, cyano, alkylamino, [ alkyl] 2 amino and -S 2 alkyl; R 5 is hydrogen or linear alkyl; X is selected from zirconium or hafnium; and Y is selected from halo, hydride, a phosphonated, sulfonated or borate anion, or a alkyl, alkenyl, alkynyl, alkoxy, -C NR a R b, NR a R b, aryl or aryloxy group which is optionally substituted with one or more groups selected from halo, alkyl, nitro, NR a R b, phenyl, alkoxy, - C NR a R b, or Si[ alkyl] 3; wherein R a and R b are independently hydrogen or alkyl. R 1 and R 2 are each independently hydrogen or linear alkyl, or R 1 and R 2 are linked such that, when taken in combination with the atoms to which they are attached, they form a 6-membered fused aromatic ring optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, aryl, heteroaryl, carbocyclic and heterocyclic, wherein each aryl, heteroaryl, carbocyclic and heterocyclic group is optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, halo, amino, nitro, cyano, alkylamino, [ alkyl] 2 amino and -S 2 alkyl; R 3 and R 4 are each independently hydrogen or linear alkyl, or R 3 and R 4 are linked such that, when taken in combination with the atoms to which they are attached, they form a 6-membered fused aromatic ring optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, aryl, heteroaryl, carbocyclic and heterocyclic, wherein each aryl, heteroaryl, carbocyclic and heterocyclic group is optionally substituted with one or more groups selected from alkyl, alkenyl, alkynyl, alkoxy, halo, amino, nitro, cyano, alkylamino, [ alkyl] 2 amino and -S 2 alkyl; R 5 is hydrogen or linear alkyl; X is selected from zirconium or hafnium; and Y is selected from halo, hydride, a phosphonated, sulfonated or borate anion, or a alkyl, alkenyl, alkynyl, alkoxy, -C NR a R b, NR a R b, aryl or aryloxy group which is optionally substituted with one or more groups selected from halo, alkyl, nitro, NR a R b, phenyl, alkoxy, - C NR a R b, or Si[ alkyl] 3; wherein R a and R b are independently hydrogen or alkyl.