Abstract Considering the importance of NIR-dyes especially with the emissive proportion to 100%, in this work, we reported series of [Ir(dpbq)2(O^O)]-heteroleptic Ir3+-complexes 1–4 (Hdpbq = 2,3-diphenylbenzo[g]quinoxaline) with typically NIR-emitting (λem = 780 nm) phosphorescence, featuring the 3LLCT-dominated and the less 3MLCT transitions’ nature. Especially in dependence on the pyrazolonate-O^O ancillary incorporation while irrelevant to the –CF3 electron-withdrawing effect, the complexes 3–4 are more efficient (Φem = 1.9–2.5%) than the β-diketonate-assisted complexes 1–2. This result expectably improved by the following structural optimization, renders [Ir(dpbq)2(O^O)]-heteroleptic Ir3+-complex system a new avenue to typically NIR-emissive emitters.

中文翻译：

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高效且唯一的 NIR 发射 (λem = 780 nm) [Ir(C^N)2(O^O)]-具有 β-二酮酸盐或吡唑啉酮酸盐型 O^O-螯合物辅助剂的杂配配合物

摘要 考虑到 NIR 染料的重要性，尤其是发射率达到 100% 的情况下，在这项工作中，我们报道了一系列 [Ir(dpbq)2(O^O)]-杂配 Ir3+-复合物 1-4 (Hdpbq = 2, 3-二苯基苯并[g]喹喔啉）具有典型的近红外发射（λem = 780 nm）磷光，具有 3LLCT 主导和较少 3MLCT 跃迁的性质。特别是依赖于吡唑啉酮-O^O辅助掺入而与-CF3吸电子效应无关，配合物3-4比β-二酮辅助配合物1-2更有效（Φem = 1.9-2.5%） . 通过以下结构优化，这一结果有望得到改善，使 [Ir(dpbq)2(O^O)]-杂配的 Ir3+-复合系统成为典型的 NIR 发射器的新途径。