Short communicationTwo efficient near-infrared (NIR) luminescent [Ir(C^N)2(N^O)]-characteristic complexes with 8-hydroxyquinoline (8-Hq) as the ancillary ligand

Add time:08/25/2019    Source:sciencedirect.com

Through the utilization of Hiqbt (1-(benzo[b]-thiophen-2-yl)-isoquinoline) or Hdpbq (2,3-diphenyl benzo[g]quinoxaline) as the C^N main ligand and 8-Hq (8-hydroxyquinoline) as the N^O ancillary ligand, two [Ir(C^N)2(N^O)]-characterized heteroleptic complexes [Ir(iqbt)2(8-q)] (1) and [Ir(dbpq)2(8-q)] (2) with desirable soluble and NIR-phosphorescent properties (λem = 687 nm with a shoulder at 756 nm, lifetime τ = 0.73 μs and quantum efficiency Φem = 0.16 for complex 1 versus λem = 786 nm, lifetime τ = 0.47 μs and quantum efficiency Φem = 0.05 for complex 2) are obtained, respectively. In comparison, the distinctive bathochromatic shift into a typical NIR region of complex 2, arisen from the large-molecule-conjugation-induced narrow energy gap, gives rise to its relatively lower quantum efficiency than that of complex 1.

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