| http://www.w3.org/ns/prov#value | - rbyl, hydrocarbylsilyl, alkoxide, aryloxide, amide or phosphide or both Q together may be an alkylidene or a cyclometallated hydrocarbyl or any other divalent anionic chelating ligand, or a diene, with the proviso that where any Q is a hydrocarbyl radical, such Q is not a substituted or unsubstituted cyclopentadienyl radical;
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