Triazoles from N-Alkynylheterocycles and Their Coordination to Iridium

N-alkynylheterocycles (benzimidazole and indazole) are
converted
to triazoles by click chemistry, and the resulting triazoles react
with [IrCl2Cp*]2. The benzimidazole-triazole
coordinates in a monodentate fashion through the benzimidazole, whereas
the indazole-triazole is bidentate through coordination of both heterocycles.
Reaction of the benzimidazole-triazole with methyliodide gives a benzimidazolium
salt that deprotonates on coordination to afford a rare example of
a bidentate NHC–triazole.