| http://www.w3.org/ns/prov#value | - 1 is zirconium or titanium, R 1 and R 2 are identical or different and are a hydrogen atom, a C 1 -C 10-alkyl group, a C 1 -C 10-alkoxy group, a C 6 -C 10-aryl group, a C 6 -C 10-aryloxy group, a C 2 -C 10-alkenyl group, a C 7 -C 40-arylalkyl group, a C 7 -C 40-alkylaryl group, a C 8 -C 40-arylalkenyl group or a halogen atom, R 3 and R 4 are identical or different and are a hydrogen atom, a haloge
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