prov:value
| - , m is 0, 1, 2, 3, 4, or 5, p is 0, 1, 2, 3, 4 or 5, and two R1 and/or R2 substituents on adjacent carbon atoms of the cyclopentadienyl ring associated there with can be joined together to form a ring containing from 4 to about 20 carbon atoms, R3 is a bridging group, n is the number of atoms in the direct chain between the two ligands and is 0, 1, 2, 3, 4, 5, 6, 7, or 8, preferably 0, 1, 2, or 3,
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