Cyclooctadiene iridium methoxide dimer
{{Chembox
|ImageFile = Ir2(OMe)2(cod)2.png
|OtherNames = bis[(cyclooctadiene]di-μ-methoxydiiridium
|Section1={{Chembox Identifiers
|CASNo = 12148-71-9
| ChemSpiderID = 21241875
|PubChem = 53216975
|PubChem_Comment = with error
|StdInChI=1S/2C8H12.2CH3O.4CH3.2Ir/c2*1-2-4-6-8-7-5-3-1;2*1-2;;;;;;/h2*1-2,7-8H,3-6H2;2*1H3;4*1H3;;/b2*2-1-,8-7-;;;;;;;;
|StdInChIKey = KIQXVKYWEDSHED-SXGOCSEPSA-N
|SMILES = CO1[Ir](O([Ir]1(C)C)C)(C)C.C1/C=C\CC/C=C\C1.C1/C=C\CC/C=C\C1
}}
|Section2={{Chembox Properties
|C=18|H=30|Ir=2|O=2
|Appearance = yellow solid
|Density = 2.552 g/cm3
}}
}}
Cyclooctadiene iridium methoxide dimer is an organoiridium compound with the formula Ir2(OCH3)2(C8H12)2, where C8H12 is the diene 1,5-cyclooctadiene. It is a yellow solid that is soluble in organic solvents. The complex is used as a precursor to other iridium complexes, some of which are used in homogeneous catalysis.{{cite journal|doi=10.1002/047084289X.rn01167|isbn=978-0471936237|title=Di-μ-methoxobis(1,5-cyclooctadiene)diiridium(I)|journal=Encyclopedia of Reagents for Organic Synthesis|year=2010|last1=Li|first1=Hongbo|last2=Colacot|first2=Thomas J.}}.
The compound is prepared by treating cyclooctadiene iridium chloride dimer with sodium methoxide.{{cite book|doi=10.1002/9780470132548.ch25|isbn=9780470132548|title=Inorganic Syntheses|year=1985|last1=Uson|first1=R.|last2=Oro|first2=L. A.|last3=Cabeza|first3=J. A.|chapter=Dinuclear Methoxy, Cyclooctadiene, and Barrelene Complexes of Rhodium(I) and Iridium(I) |volume=23|pages=126–130}} In terms of its molecular structure, the iridium centers are square planar as is typical for a d8 complex. The Ir2O2 core is folded.{{cite journal|doi=10.1016/j.poly.2016.03.022|title=Triazenide complexes of iridium. Evidence for [Ir(η1-N3Ph2)(HN3Ph2)(1,5-cod)], Structures of [Ir2(μ-OMe)2(1,5-cod)2], [Ir2(μ-N3Ph2)2(1,5-cod)2], [Ir(η2-N3Ph2)(H)(SiPh3)(1,5-cod)], [Ir(η2-N3Ph2)(H)(SnPh3)(1,5-cod)] and [Ir(η2-N3Ph2)(SC6F5)2(1,5-cod)]|year=2016|last1=Carlton|first1=Laurence|last2=Nyoni|first2=Michelle S.|last3=Fernandes|first3=Manuel A.|journal=Polyhedron|volume=119|pages=194–201}}