Abstract 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.

中文翻译：

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两种高效的近红外 (NIR) 发光 [Ir(C^N)2(N^O)] 特征配合物，以 8-羟基喹啉 (8-Hq) 作为辅助配体

摘要 通过利用 Hiqbt (1-(benzo[b]-thiophen-2-yl)-isoquinoline) 或 Hdpbq (2,3-diphenyl benzo[g]quinoxaline) 作为 C^N 主要配体和 8-Hq ( 8-羟基喹啉）作为 N^O 辅助配体，两个 [Ir(C^N)2(N^O)] 表征的杂配配合物 [Ir(iqbt)2(8-q)] (1) 和 [Ir( dbpq)2(8-q)] (2) 具有理想的可溶性和 NIR 磷光特性（λem = 687 nm，肩峰为 756 nm，寿命 τ = 0.73 μs，复合物 1 的量子效率 Φem = 0.16 与 λem = 786 nm，分别获得了复合物 2) 的寿命 τ = 0.47 μs 和量子效率 Φem = 0.05。相比之下，由大分子共轭诱导的窄能隙引起的复合物 2 向典型 NIR 区域的独特红移，导致其量子效率比复合物 1 低。