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

Abstract

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.