| http://www.w3.org/ns/prov#value | - M1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum, R14 and R15 are identical or different and are a hydrogen atom, a halogen atom, a (C1-C10)-alkyl group, a (C1-C10)-alkoxy group, (C6-C10)-aryl group, a (C6-C10)-aryloxy group, a (C2-C10)-alkenyl group, a (C7-C40)-arylalkyl group, a (C7-C40)-alkylaryl group or a (C8-C40)-arylalkenyl group, m is 1 or 2, R16 and R17 are identical or d
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