Fig. 3. The X-ray crystal structures of (b) Ir-BB·pyridine and (e) Ir-BB·DMAP were formed through the coordination of Ir-BB and two pyridine molecules by mode 1 (a) and two DMAP molecules by mode 2 (d), respectively. Titrations of Ir-BB in d6-DMSO with excess pyridine (c) and DMAP (f) monitored by 1H NMR spectroscopy.
