Iridium cyclometallated bipyridine complex

To date, the cyclometallated bonding mode has not been directly observed in complexes of terpy or higher oligopyridines. However, the unequivocal demonstration of a cyclometallated 2,2 -bipyridine moiety in iridium complexes suggests that such a possibility exists 71,130,131,145,233,419, 420, 478). There is H NMR and kinetic evidence to suggest that cyclometallated intermediates are not involved in the deuteration of [Rufterpylj] at the 3, 3, 5, and 5" positions 138). 

The afore-mentioned challenge has been reached with an heteroleptic C N cyclometalated iridium(iii) complex incorporating a monostyryl/ distyryl BODIPY ligand via acetylide bonds of 2,2 -bipyridine, see Fig. 10. This complex shows both absorption and fluorescence emission bands in the near infra-red region (NIR) and exceptionally long-lived triplet excited states (t = 156.5). ... 

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