Onderdelinden, A. L.; van der Ent, A. Inorg. Chim. Acta 1972, 6, 420.
This paper gives you the complete procedure.
"...Bis[ p-chlorobis(cyclooctene)iridium(I), [Ir(Cl(C8H14)2]2 (la) was prepared in high yield by refluxing ammonium chloroiridite, (NH4)3IrCl6.H20, with cyclooctene in a 2-propanol/water mixture. Chlorotetrakis(ethylene)iridium(I), IrCl(C2H4)4 (2), is prepared by treating a suspension of la in heptane with ethylene at 0°C and subsequently cooling to -50°C. Up to 100°C it is stable under ethylene* under nitrogen it is only stable below about -50°C. At higher temperatures, it looses two molecules of ethylene and dimerizes to [IrCl(C2H4)2]2 (3)..."
Article Chloro- and bromo-(alkene)iridium(I) complexes
Miss/Mrs Laskar,
Please find below references in the topic of your question:
1. A. Onderdelinden and A. van der Ent, Chloro- and Bromo-(alkene)iridium(I) Complexes, lnorganica Chimica Acta, 6 (1972) 420 - 424
2. G. Winkhaus, H. Singer, Iridium(1)-Olefmkomplexe, Chem. Ber (1966) 3610-3618
3. M. Arthurs, J. Bickerton, S. Stobart, J. Wang, Pyrazolyl-Bridged Iridium Dimers. 17.1 Tetrakis(alkene)diiridium(I) Complexes: [Ir(n2-C2H4)2(m-Cl)]2 as a Precursor to [Ir(n2-C2H4)2(m-pz)]2. Stereochemically Nonrigid Behavior of the Analogue [Ir(n2-C2H4)(n2-C2F4)(m-Cl)]2, Organometallics 17 (1998) 2743-2750
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