A transition metal complex represented by the formula: wherein M is Hf or Zr; each Q is neutral donor group comprising at least one atom from O, N, S or P, and R 3 is not present when Q is O or S; each L is independently and is not part of an aromatic ring; y is 2, 3, 4, 5, or 6; X 1 and X 2 are, independently, a univalent C 1 to C 20 hydrocarbyl radical, a C 1 to C 20 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, or X 1 and X 2 join together to form a C 4 to C 62 cyclic, polycyclic or heterocyclic structure; R 1 is a divalent C 1 -C 40 hydrocarbyl radical or divalent substituted hydrocarbyl radical comprising a portion that comprises a linker backbone comprising from 1 to 18 carbon atoms linking or bridging between the two Q groups; each R a, R b, R c, R d, R e, R f, R g, and R h is, independently, a hydrogen, a C 1 -C 40 hydrocarbyl radical, a C 1 -C 40 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, or two or more of R a to R h may independently join together to form a C 4 to C 62 cyclic, polycyclic or heterocyclic structure, or a combination thereof; each R 2 is, independently, a hydrogen, a C 1 -C 40 hydrocarbyl radical, a C 1 -C 40 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, or two or more adjacent R 2 groups may independently join together to form a C 4 to C 62 cyclic or polycyclic ring structure, or a combination thereof, provided that such cyclic or polycyclic ring structure is not aromatic; and each R 3 is, independently, a hydrogen, a C 1 -C 40 hydrocarbyl radical, a C 1 -C 40 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, wherein a substituted hydrocarbyl radical is a radical made of carbon and hydrogen where at least one hydrogen is replaced by a heteroatom or heteroatom-containing group. wherein M is Hf or Zr; each Q is neutral donor group comprising at least one atom from O, N, S or P, and R 3 is not present when Q is O or S; each L is independently and is not part of an aromatic ring; y is 2, 3, 4, 5, or 6; X 1 and X 2 are, independently, a univalent C 1 to C 20 hydrocarbyl radical, a C 1 to C 20 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, or X 1 and X 2 join together to form a C 4 to C 62 cyclic, polycyclic or heterocyclic structure; R 1 is a divalent C 1 -C 40 hydrocarbyl radical or divalent substituted hydrocarbyl radical comprising a portion that comprises a linker backbone comprising from 1 to 18 carbon atoms linking or bridging between the two Q groups; each R a, R b, R c, R d, R e, R f, R g, and R h is, independently, a hydrogen, a C 1 -C 40 hydrocarbyl radical, a C 1 -C 40 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, or two or more of R a to R h may independently join together to form a C 4 to C 62 cyclic, polycyclic or heterocyclic structure, or a combination thereof; each R 2 is, independently, a hydrogen, a C 1 -C 40 hydrocarbyl radical, a C 1 -C 40 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, or two or more adjacent R 2 groups may independently join together to form a C 4 to C 62 cyclic or polycyclic ring structure, or a combination thereof, provided that such cyclic or polycyclic ring structure is not aromatic; and each R 3 is, independently, a hydrogen, a C 1 -C 40 hydrocarbyl radical, a C 1 -C 40 substituted hydrocarbyl radical, a heteroatom or a heteroatom-containing group, wherein a substituted hydrocarbyl radical is a radical made of carbon and hydrogen where at least one hydrogen is replaced by a heteroatom or heteroatom-containing group.