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The present invention provides racemic complexes of formula (I) Figure 112014007903648-pct00105 Where M is zirconium or hafnium; Each X is a sigma ligand; L is -R '2 C-, -R' 2 C-CR '2 -, -R' - is a divalent bridge selected from, -R '2 Ge-, 2 Si- , -R' 2 Si-SiR '2 wherein each R 'is independently hydrogen, C 1 -20 - hydrocarbyl, tri (C 1 -20 - alkyl) silyl, C 6 -20 - aryl, C 7 -20 - aryl or C 7 -20 - Alkylaryl; R 2 and R 2 'are each independently from the group C 1 -20 14 to 16 containing one or more heteroatoms, optionally hydrocarbyl radical; R 5 'is the Bill containing one or more heteroatoms and optionally C 1 -20 optionally one or more halo atoms substituted hydrocarbyl groups from 14 to 16 group.