A catalyst compound represented by formula (I): wherein: M is a group 4 metal, preferably Zr, Ti or Hf; Y 1 and Y 2 are independently Si, Ge, or C, where at least one of Y 1 and Y 2 is not C, preferably at least one of Y 1 and Y 2 is Si, more preferably Y 1 and Y 2 are Si; X 1 and X 2 are independently hydrogen, halide, hydroxyl, or C 1 -C 50 substituted or unsubstituted hydrocarbyl, amide, alkoxide, sulfide, phosphide, or combination thereof, or X 1 and X 2 are joined together to form a metallocycle ring, or X 1 and X 2 are joined to form a chelating ligand, or an alkylidene; each of R 1 , R 2 , R 3 , R 5 , R 6 , R 2 , R 9 , R 10 , R 11 , R 12 , R 13 , and R 14 is independently hydrogen, halogen, C 4 -C 50 hydrocarbyl or C 4 -C 50 substituted hydrocarbyl, halocarbyl, silylcarbyl, alkoxyl, siloxyl, or one or more of R 1 and R 2 , R 2 and R 3 and R 5 and R 6 , are joined to form a saturated cyclic ring, substituted saturated cyclic ring, a substituted unsaturated cyclic ring, or an unsubstituted unsaturated cyclic ring; R 4 is halogen, silylcarbyl, substituted silylcarbyl, C 1 -C 40 hydrocarbyl, substituted C 1 -C 40 hydrocarbyl, C 6 -C 10 aryl, substituted C 6 -C 10 aryl, fluorenylidenyl, substituted fluorenylidenyl, or -NR' 2 , -SR', -OR', -OSiR' 3 , -PR' 2 , where each R' is hydrogen, halogen, C 1 -C 40 alkyl, or C 6 -C 10 aryl, or R 3 and R 4 , are joined to form a saturated cyclic ring, substituted saturated cyclic ring, a substituted unsaturated cyclic ring, or an unsubstituted unsaturated cyclic ring, or R 4 is hydrogen and R 2 and R 3 are joined to form a saturated cyclic ring, substituted saturated cyclic ring, or an unsubstituted unsaturated cyclic ring; and R 8 is hydrogen, halogen, C 1 -C 40 hydrocarbyl, substituted C 1 -C 40 hydrocarbyl, silylcarbyl, silyl, substituted silylcarbyl, C 6 -C 10 aryl, substituted C 6 -C 10 aryl, -NR' 2 , -SR', - OR', -OSiR' 3 , -PR' 2 , where each R' is hydrogen, halogen, C 1 -C 10 alkyl, or phenyl. M is a group 4 metal, preferably Zr, Ti or Hf; Y 1 and Y 2 are independently Si, Ge, or C, where at least one of Y 1 and Y 2 is not C, preferably at least one of Y 1 and Y 2 is Si, more preferably Y 1 and Y 2 are Si; X 1 and X 2 are independently hydrogen, halide, hydroxyl, or C 1 -C 50 substituted or unsubstituted hydrocarbyl, amide, alkoxide, sulfide, phosphide, or combination thereof, or X 1 and X 2 are joined together to form a metallocycle ring, or X 1 and X 2 are joined to form a chelating ligand, or an alkylidene; each of R 1 , R 2 , R 3 , R 5 , R 6 , R 2 , R 9 , R 10 , R 11 , R 12 , R 13 , and R 14 is independently hydrogen, halogen, C 4 -C 50 hydrocarbyl or C 4 -C 50 substituted hydrocarbyl, halocarbyl, silylcarbyl, alkoxyl, siloxyl, or one or more of R 1 and R 2 , R 2 and R 3 and R 5 and R 6 , are joined to form a saturated cyclic ring, substituted saturated cyclic ring, a substituted unsaturated cyclic ring, or an unsubstituted unsaturated cyclic ring; R 4 is halogen, silylcarbyl, substituted silylcarbyl, C 1 -C 40 hydrocarbyl, substituted C 1 -C 40 hydrocarbyl, C 6 -C 10 aryl, substituted C 6 -C 10 aryl, fluorenylidenyl, substituted fluorenylidenyl, or -NR' 2 , -SR', -OR', -OSiR' 3 , -PR' 2 , where each R' is hydrogen, halogen, C 1 -C 40 alkyl, or C 6 -C 10 aryl, or R 3 and R 4 , are joined to form a saturated cyclic ring, substituted saturated cyclic ring, a substituted unsaturated cyclic ring, or an unsubstituted unsaturated cyclic ring, or R 4 is hydrogen and R 2 and R 3 are joined to form a saturated cyclic ring, substituted saturated cyclic ring, or an unsubstituted unsaturated cyclic ring; and R 8 is hydrogen, halogen, C 1 -C 40 hydrocarbyl, substituted C 1 -C 40 hydrocarbyl, silylcarbyl, silyl, substituted silylcarbyl, C 6 -C 10 aryl, substituted C 6 -C 10 aryl, -NR' 2 , -SR', - OR', -OSiR' 3 , -PR' 2 , where each R' is hydrogen, halogen, C 1 -C 10 alkyl, or phenyl. <EOS>