In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Unbridged Rh(II)-Rh(II) complexes of N-heterocyclic carbenes and reactions with O2 to form dirhodium(μ-η1:η1-O2) complexes, published in 2019, which mentions a compound: 14694-95-2, Name is Tris(triphenylphosphine)chlororhodium, Molecular C54H45ClP3Rh, Name: Tris(triphenylphosphine)chlororhodium.
Dimeric rhodium(II) complexes and rhodium(III) peroxide complexes supported by N-heterocyclic carbenes were synthesized. The treatment of [Ag3(L)2](PF6)3 (L = bis(N-pyridylimidazolylidenyl)methane) with [Rh(COD)Cl] afforded [Rh(L)(CH3CN)]2(PF6)4 in which two [Rh(L)] moieties are bound together via an unsupported Rh-Rh bond. The substitution of axial acetonitrile by phosphines led to the insertion of O2 into the Rh-Rh bond and the isolation of [Rh(L)(PPh3)]2(μ-η1:η1-O2)(PF6)4 and [Rh(L)(PCy3)]2(μ-η1:η1-O2) (PF6)4.
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Reference:
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate