Metallocenes with two -Si-Si- bridges

A catalyst compound represented by Formula (I):

• wherein:
• M is a group 4 metal;
• each of R1, R2, and R3 is independently hydrogen, alkoxide, C1 to C40 substituted or unsubstituted hydrocarbyl, or —R15—SiR′3 where R15 is C1 to C4 hydrocarbyl, and each R′ is independently hydrogen or C1 to C20 substituted or unsubstituted hydrocarbyl;
• each of R4, R5, and R6 is independently hydrogen, alkoxide, C1 to C40 substituted or unsubstituted hydrocarbyl, or —R15—SiR′3 where R15 is C1 to C4 hydrocarbyl, and each R′ is independently hydrogen or C1 to C20 substituted or unsubstituted hydrocarbyl, or two or more of R4, R5, and R6 form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent ring;
• each of X1 and X2 is independently a diene ligand, an alkylidene ligand, or a univalent anionic ligand;
• each of T1, T2, T3, and T4 is independently Si or Ge;
• each of R7, R8, R9, R10, R11, R12, R13, and R14 is independently hydrogen or a C1-C20 containing hydrocarbyl, substituted hydrocarbyl, or one or more of R7 and R8, R9 and R10, R11 and R12, and R13 and R14 join to form a substituted or unsubstituted, saturated, partially unsaturated, cyclic or polycyclic substituent;
• T1 is bonded to Carbon 1, Carbon 4, or Carbon 5;
• R1 is bonded to Carbon 1, Carbon 4, or Carbon 5;
• R2 is bonded to Carbon 1, Carbon 4, or Carbon 5;
• T2 is bonded to Carbon 1′, Carbon 4′, or Carbon 5′;
• R5 is bonded to Carbon 1′, Carbon 4′, or Carbon 5′;
• and
• R6 is bonded to Carbon 1′, Carbon 4′, or Carbon 5′.