New Luminescent Cyclometalated Iridium(III) Diimine Complexes as Biological Labeling Reagents

We report the synthesis, characterization, and photophysical and electrochemical properties of thirty luminescent cyclometalated iridium(III) diimine complexes [Ir(N-C)2(N-N)](PF6) (HN-C = 2-phenylpyridine, Hppy; 2-(4-methylphenyl)pyridine, Hmppy; 3-methyl-1-phenylpyrazole, Hmppz; 7,8benzoquinoline, Hbzq; 2-phenylquinoline, Hpq; N-N = 4-amino-2,2ʹ-bipyridine, bpy-NH2; 4-isothiocyanato-2,2ʹ-bipyridine, bpy-ITC; 4-iodoacetamido-2,2ʹbipyridine, bpy-IAA; 5-amino-1,10-phenanthroline, phen-NH2; 5-isothiocyanato-1,10-phenanthroline, phen-ITC; 5-iodoacetamido-1,10-phenanthroline, phen-IAA). The X-ray crystal structure of [Ir(mppz)2(bpy-NH2)](PF6) has also been investigated.