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 ∗  = C 5 Me 5 , Ar = Ar′ = C 6 H 5 , 1 ; Ar = Ar′ =  o -CF 3 -C 6 H 4 , 2 ; Ar = Ar′ =  o -HOCH 2 -C 6 H 4 , 3 ; Ar =  o -HOCH 2 -C 6 H 4 , Ar′ =  p -CH 3 -C 6 H 4 , 4 ) have been obtained by reaction of iridium dimer [Cp ∗ IrCl 2 ] 2 with the corresponding triazenes in the presence of NEt 3 in CH 3 CN. 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.