The asymmetric unit contains two mononuclear molecules. The coordination around each Th atom is a slightly distorted tetrahedron with three Pi-bonded indenyl rings and one sigma-bonded methyl ligand. Th-C(indenyl) distances range from 2.69(2) to 3.04(2) Angstroms and indicate a trihapto mode of bonding of the indenyl rings through the outer, non-bridging C atoms, as previously observed in other tris-(indenyl) complexes of thorium and uranium. The Th-C bonds to ethyl-substituted indenyl C atoms are longer than the other Th-C(non-bridging) bonds. Th-C(methyl) distances average 2.49(3) Angstroms. In one molecule each CH(2)-CH(3) bond is approximately normal to the plane of the indenyl ring to which it is attached, while in the other molecule only two of the ethylindenyl ligands adopt this conformation; in the third ligand, the ethyl group lies in the plane of the indenyl ring. The crystal is stabilised by Van der Waals interactions.
Bibliographic Reference: Article: Acta Crystallographica, Vol. 49 (1993) pp. 1138-1140
Record Number: 199311507 / Last updated on: 1994-11-28
Original language: en
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