Synthesis, Structure, and Optical Properties of Cyclometalated Iridium(III) Complexes with 2-Arylbenzimidazoles and Pyrazino[2,3-f][1,10]phenanthroline

IF 1.1 3区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR
E. A. Sholina, S. I. Bezzubov
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引用次数: 0

Abstract

Two new iridium(III) complexes with benzimidazole ligands differing in the size of the aromatic system and an auxiliary N-donor ligand with an extended conjugated system were synthesized and studied by structural and spectroscopic methods. A comparison of the results of crystal packing analysis with the data of electronic absorption spectroscopy, diffuse reflectance spectroscopy, and luminescence spectroscopy shows that intermolecular π–π interactions between the benzimidazole ligands have little effect on the optical characteristics of the complexes. Both compounds exhibit light absorption in the 250–550 nm range (ε = 58 000–1000 M–1 cm–1) in solution and in the solid state (Eg = 2.14–2.16 eV) and emit in the orange region (λmax = 558–585 nm), with the maxima of solid-state emission systematically red-shifted by approximately 25 nm compared to emission in solution. The results of this work provide a better understanding of the extent to which crystal packing affects the optical properties of iridium(III) complexes and will be used in further development of crystal engineering approaches for designing iridium-based luminescent compounds in the long-wavelength region.

Abstract Image

Abstract Image

环金属化铱(III)与2-芳基苯并咪唑和吡嗪[2,3-f][1,10]菲罗啉配合物的合成、结构和光学性质
合成了两种不同尺寸的苯并咪唑配体和一种具有扩展共轭体系的辅助n -给体铱(III)配合物,并用结构和光谱方法对其进行了研究。晶体堆积分析结果与电子吸收光谱、漫反射光谱和发光光谱数据的比较表明,苯并咪唑配体的分子间π -π相互作用对配合物的光学特性影响不大。两种化合物在溶液和固态(Eg = 2.14-2.16 eV)中均表现出250-550 nm范围内的光吸收(ε = 58 000-1000 M-1 cm-1),并在橙色区域(λmax = 558-585 nm)发射,其中固态发射的最大值比溶液中的发射系统红移了约25 nm。这项工作的结果更好地理解了晶体填充对铱(III)配合物光学性质的影响程度,并将用于进一步开发晶体工程方法来设计长波长区域的铱基发光化合物。
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来源期刊
Russian Journal of Coordination Chemistry
Russian Journal of Coordination Chemistry 化学-无机化学与核化学
CiteScore
2.40
自引率
15.80%
发文量
85
审稿时长
7.2 months
期刊介绍: Russian Journal of Coordination Chemistry is a journal that publishes reviews, original papers, and short communications on all aspects of theoretical and experimental coordination chemistry. Modern coordination chemistry is an interdisciplinary science that makes a bridge between inorganic, organic, physical, analytical, and biological chemistry.
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