N-Heterocyclic Dicarbene Iridium(III) Pincer Complexes Featuring Mixed NHC/Abnormal NHC Ligands and Their Applications in the Transfer Dehydrogenation of Cyclooctane

Pincer‐Type Complexes for Catalytic (De)Hydrogenation and Transfer (De)Hydrogenation Reactions: Recent Progress

“…Thus, in the last five years, various systems have been reported that utilize iridium NHC or PCP, PSCOP, POCOP, AsOCOAs pincer complexes (Figure 8). 80, 93, 107–117…”

“…It is noteworthy that this reaction is inhibited by both the hydrogen acceptor TBE and the product COE. Table 17, entry 2 shows only a low TON (TOF 0.36 h −1 ) for the transformation of COA to COE due to the low solubility of the catalyst 83 in the reaction mixture 107. The group of Yamamoto described in their manuscript the temperature dependency of the reaction rates and TONs (Table 17, entry 3); they obtained higher activity at higher temperatures 108.…”

Molecular Engineering of Iridium Blue Emitters Using Aryl N‐Heterocyclic Carbene Ligands

“…Since the first report of an isolable N‐heterocyclic carbene (NHC) ligand, their use has spread far and wide . Many cyclometalated Ir III complexes have also been reported . Neutral [Ir(arylNHC) 3 ] complexes have been reported to exhibit high‐energy emission with high PLQYs , .…”

“…[9][10][11][12] Many cyclometalated Ir III complexes have also been reported. [13][14][15] Neutral [Ir(arylNHC) 3 ] complexes heterocyclic carbene (NHC) ligand from 2,4-dimethoxyphenyl to 6-methoxy-2-methyl-3-pyridyl, the energy levels of the Ir complexes were modified to produce new blue emitters with increased HOMO and triplet-state energies. OLED devices fabricated with these emitters showed external quantum efficiencies (EQEs) in the range of 2.3-3.2 % with low turn-on values of 2.7-2.9 V and efficacies of up to 6.3 %.…”

Catalytic alkane dehydrogenations

“…In 2011, Zuo and Braunstein [84] developed similar bis(carbene)-based pincer iridium complex 29 for transfer dehydrogenation of COA in the presence of TBE at 200°C (Eq. (25)).…”