Patent ID: 8426540

Claim:
A metallic complex of formula (IV): wherein R 1 to R 8 are independently selected from H, halogens, substituted or unsubstituted C 1 -C 20 hydrocarbyls or inert functional groups, each R 1 to R 8 can be linked to a neighbouring substituent in order to form a cycle with carbon atoms to which said radicals are attached; Y is selected from O or NR*, R* selected from C 1 -C 12 alkyls or C 6 -C 12 aryls; m is 0, 1 or 2 and is a metal belonging to the groups 4 to 7 of the Periodic Classification; X is selected from halogens, substituted or unsubstituted C 1 -C 20 hydrocarbyl groups, amino groups, aryloxy groups and alkoxy groups; and n is a numeral value determined by the oxidation state of M minus one.