Abstract
A reaction between [(COD)IrCl]2 (COD is cyclo-octa-1,5-diene), HCl and indene failed to provide the hoped for chlorido-indenyliridium dimer, but instead produced the title compound, [IrCl3(CH3CN)(C8H12)], which is an octa-hedral complex of iridium(III) with a chelating cyclo-octa-1,5-diene ligand, three chloride ligands in a fac arrangement, and one aceto-nitrile ligand. Attempts to devise a rational synthesis for the title compound were unsuccessful.
Highlights
A reaction between [(COD)IrCl]2 (COD is cycloocta-1,5-diene), HCl and indene failed to provide the hoped for chloridoindenyliridium dimer, but instead produced the title compound, [IrCl3(CH3CN)(C8H12)], which is an octahedral complex of iridium(III) with a chelating cycloocta-1,5-diene ligand, three chloride ligands in a fac arrangement, and one acetonitrile ligand
Attempts to devise a rational synthesis for the title compound were unsuccessful
The title compound is a pseudo-octahedral complex of iridium with three chloride ligands occupying one face of the octahedron and the alkenes of the COD and the acetonitrile ligand occupying the opposite face (Fig. 1)
Summary
We have published recently on the synthesis of a series of tetramethylalkylcyclopentadienyliridium complexes by the direct reaction between tetramethylalkylcyclopentadiene and iridium chloride, giving the [Cp*RIrCl2]2 dimer (Morris et al, 2014). Some of the reactions produced low yields of the chlorido-bridged dimer, limiting the number of products that could be made and tested. An alternate route to Cp*-type chlorido iridium dimers was reported using [(COD)IrCl]2 as the starting material (El Amouri et al, 1994) and, in our hands, this route does have promise for providing higher yields for many of the compounds. Rectangular prisms had formed in the sample. These crystals were examined by X-ray crystallography and the results of that structure determination are reported here
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