Received 31 August 2013
The asymmetric unit of the title compound, [Ir(C9H7)(C2H4)2], consists of two independent molecules. The bonding between iridium and the five-membered ring of the indenyl ligand shows the usual asymmetry associated with the typical ring slippage responsible for the enhanced activity of indenyl metal compounds when compared with the analogous cyclopentadienyl metal compound. There are three short Ir-C bonds of 2.210 (3), 2.190 (4) and 2.220 (3) Å and two long Ir-C bonds to the C atoms that are part of the fused six-membered ring of 2.349 (4) and 2.366 (3) Å for one of the independent molecules [2.208 (4), 2.222 (3), 2.197 (4) Å for the short distances and 2.371 (3) and 2.358 (3) Å for the long distances in the second molecule]. This results in both indenyl ligands being slightly kinked, with dihedral angles of 6.8 (4)° and 6.5 (4)°.
For the structures of the analogous rhodium(I) complex determined from single crystal X-ray data, see: CCDC:576585 (Marder et al., 1987); CCDC:567925 (Mlekuz et al., 1986). For a variable temperature NMR study of the title compound, see: Szajek et al. (1991). The structure of an 3-indenyliridium complex can be found in CCDC:563532 (Merola et al., 1986). For seminal discussions on the "indenyl effect" see: Hart-Davis et al. (1970); Rerek et al. (1983). The synthesis of [Ir(C2H2)2Cl]2 can be found in Herde et al. (1974).
Data collection: CrysAlis PRO (Agilent, 2013); cell refinement: CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2008); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: PK2496 ).
The author thanks the National Science Foundation for funds (CHE-01311288) for the purchase of the diffractometer. The author recognizes the payment of the open access fee by Virginia Tech University Libraries.
Agilent (2013). CrysAlis PRO. Agilent Technologies UK Ltd, Yarnton, England.
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