Chlorobis(cyclooctene)iridium dimer

Chlorobis(cyclooctene)iridium dimer is an organoiridium compound with the formula Ir2Cl2(C8H14)4, where C8H14 is cis-cyclooctene. Sometimes abbreviated Ir2Cl2(coe)4, it is a yellow, air-sensitive solid that is used as a precursor to many other organoiridium compounds and catalysts.

Chlorobis(cyclooctene)iridium dimer
Names
IUPAC name
Chlorobis(cyclooctene)iridium(I) dimer
Other names
Di-μ-chlorotetrakis(cyclooctene)diiridium(I), [Ir(coe)2Cl]2
Identifiers
3D model (JSmol)
ECHA InfoCard 100.159.657
  • InChI=1S/4C8H14.2ClH.2Ir/c4*1-2-4-6-8-7-5-3-1;;;;/h4*1-2H,3-8H2;2*1H;;/p-2/b4*2-1-;;;;
    Key: CJJIQMGSHWWMCK-XFCUKONHSA-L
  • C1CCCC=CCC1.C1CCCC=CCC1.C1CCCC=CCC1.C1CCCC=CCC1.[Cl-].[Cl-].[Ir].[Ir]
Properties
C32H56Cl2Ir2
Molar mass 896.13
Appearance yellow solid
Melting point 160-165 °C
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315, H319, H335[1]
P261, P280, P304+P340, P305+P351+P338, P321, P332+P313, P362, P403+P233, P405, P501[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The compound is prepared by heating an alcohol solution of sodium hexachloroiridate with cyclooctene in ethanol.[2] The coe ligands are easily displaced by other more basic ligands, more so than the diene ligands in the related complex cyclooctadiene iridium chloride dimer. For example, with triphenylphosphine (PPh3), it reacts to give IrCl(PPh3)3:[3]

Ir2Cl2(C8H14)4 + 6 PPh3 → 2 IrCl(PPh3)3 + 4 C8H14

References
  1. "Chlorobis(cyclooctene)iridium Dimer SDS". American Elements. Retrieved 2018-08-24.
  2. van der Ent, A.; Onderdelinden, A. L. (1973). "Chlorobis(cyclooctene)rhodium(I) and -Iridium(I) Complexes". Inorganic Syntheses. 14: 92–95. doi:10.1002/9780470132456.ch18.
  3. Bennett, M. A.; Latten, J. L. (1989). "An Iridium(III) Complex Containing Cyclometallated Triphenylphosphine Formed by Isomerization of an Iridium(I) Triphenylphosphine Complex". Inorganic Syntheses. 26: 200–203. doi:10.1002/9780470132579.ch35.
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