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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Highly luminescent 2-phenylpyridine-free diiridium complexes with bulky 1,2-diarylimidazole cyclometalating ligands
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Highly luminescent 2-phenylpyridine-free diiridium complexes with bulky 1,2-diarylimidazole cyclometalating ligands

机译：高温2-苯基吡啶二亚吡啶配合物，具有庞大的1,2-二芳基咪唑环跨越配体

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摘要

While a number of highly emissive dinuclear Ir(iii) complexes have been reported, they have generally been restricted to structures based on 2-phenylpyridine (Hppy) cyclometalates. We now present a series of new hydrazide-bridged diiridium complexes (5-8) which incorporate bulky 1,2-diarylimidazole cyclometalating ligands in the place of Hppy. Complexes 6-8 are strongly emissive when doped into poly(methyl methacrylate) (PMMA), displaying the highest PLQYs yet reported for ppy-free diiridium emitters (phi(PL) = 47-55 +/- 10%). Notably, complex 8 has an emission peak at 452 nm and CIExy colour coordinates in the sky-blue region (0.18, 0.27), which is competitive with state-of-the-art monoiridium analogues. X-ray crystallography and solution-state F-19 NMR spectra reveal the presence of rigidifying intramolecular - interactions for complexes 6-8, which explains their improved photophysical performance compared to 5 which does not have these interactions. Structure-property relationships are further rationalised through density functional theory (DFT) and cyclic voltammetry (CV) data. All the complexes studied in this work display aggregation induced phosphorescent emission (AIPE). This series of compounds increases the structural diversity of highly luminescent dinuclear Ir(iii) complexes to include luminophoric ligands that are not restricted to Hppy-type fragments. The colour range accessible to AIPE-active diiridum complexes has also been substantially broadened.
机译：虽然已经报道了许多高发射的硫赤IR（III）配合物，但它们通常仅限于基于2-苯基吡啶（HPPY）环核的结构。我们现在提出了一系列新的肼桥桥桥络合物（5-8），其掺入了庞大的1,2-二芳基咪唑的基芯矛盾的配体在HPPY的地方。当掺杂到聚（甲基丙烯酸甲酯）（PMMA）中时，复合物6-8是强烈的发光，显示出尚未报道的PPY-Diiridium发射器（PHI（PL）= 47-55 +/- 10％）。值得注意的是，复杂的8在天蓝色区域（0.18,0.27）中的452nm和Ciexy颜色坐标的发射峰值，其与最先进的单一铱类似物具有竞争力。 X射线晶体术和溶液 - 状态F-19 NMR光谱显示出刚性分子内 - 复合物6-8的相互作用的存在，其解释了与没有这些相互作用的5的改善的光学性能。结构性质关系通过密度泛函理论（DFT）和循环伏安法（CV）数据进一步合理化。在这项工作中研究的所有复合体显示聚集诱导的磷光发射（AIPE）。该系列化合物增加了高亮度的硫核IR（III）配合物的结构分集，包括不限于HPPY型碎片的发光体配体。 AIPE活性二胞型复合物可获得的颜色范围也基本上扩大了。

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