never seen that "fac" terminology anywhere else. guess it refers to how the iridium, instead of simply bonding to the pyridine nitrogen, also (apparently!) strips a proton from the adjacent phenyl, making a bidentate ligand
(hexacoördinated, not hexadentate, bleh)
other arylpyridine ligands work. it's just plain simple "heat the ligand with IrCl3". more cooking than chemistry haha
what are these iridium complexes useful for? photocatalysts, apparently
also the stuff is spectacularly yellow