| http://www.w3.org/ns/prov#value | - cyclopentadienyl, indenyl, substituted indenyl, azulenyl, substituted azulenyl, fluorenyl, substituted fluorenyl groups and mixtures thereof, X is halogen atom, p is an integer of 1, q is an integer of 3, p+q is equal to the valence of metal M.sup.2.
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