Iridium (III) 1,3-bis(aryl)triazenide complexes: Synthesis, characterization and structure

• Bis(aryl)triazene including hydroxymethyl groups was synthesized and characterized.
• Iridium (III) bis(aryl)triazenide complexes were synthesized and characterized.
• Molecular structures of the four iridium triazenide complexes were obtained.
• Triazenide coordination as monoanionic bidentate ligands was confirmed.

Iridium (III) 1,3-bis(aryl)triazenide complexes [Cp∗IrCl(ArNNNAr′)] (Cp∗ = C5Me5, Ar = Ar′ = C6H5, 1; Ar = Ar′ = o-CF3-C6H4, 2; Ar = Ar′ = o-HOCH2-C6H4, 3; Ar = o-HOCH2-C6H4, Ar′ = p-CH3-C6H4, 4) have been obtained by reaction of iridium dimer [Cp∗IrCl2]2 with the corresponding triazenes in the presence of NEt3 in CH3CN. The iridium complexes 1–4 were characterized by IR, ESI-MS and NMR spectroscopy. In all of the complexes, the triazenes are coordinated to iridium (III) as monoanionic bidentate N,N′-donor ligands. Compounds 1–4 are the first examples studied by single crystal X-ray diffraction of mononuclear bis(aryl)triazenide iridium complexes, where the N-N-N fragment effectively chelates the Ir (III) central atom.

The synthesis and characterization of Cp∗Ir complexes containing ortho-functionalized 1,3-bis(aryl)triazenide ligands has been carried out. The molecular structures of all of the complexes confirm the bonding of the triazenide ligands as chelates.Figure optionsDownload as PowerPoint slide