Bis-cyclometalated Ir(III) complexes with carbazole/triphenylamine donor fragment for oxygen sensing

IF 1.6 4区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR Transition Metal Chemistry Pub Date : 2024-04-28 DOI:10.1007/s11243-024-00582-x

Hongcui Yu, Bo Yu, Yajiao Song, Jiawei Li

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Abstract

Bis-cyclometalated Ir(III) complexes Ir(ppy-Carbazole)₂(acac) and Ir(ppy-NPh₃)₂(acac) (acac = acetylacetonate) based on the 2-phenylpyridine (ppy) with carbazole or triphenylamine moieties were prepared, characterized and tested as phosphorescent materials. The photophysical properties of the two complexes were investigated by comparing them with the unsubstituted parent Ir(III) complex Ir(ppy)₂(acac). Complexes Ir(ppy-Carbazole)₂(acac) and Ir(ppy-NPh₃)₂(acac) with carbazole/triphenylamine-appended C^N cyclometalating ligands exhibit larger molar extinction coefficients and longer luminescence lifetimes compared to the unsubstituted parent Ir(ppy)₂(acac). Based on a rational design strategy by combining a ppy unit and electron-donating carbazole or triphenylamine segment, we investigated the merits of the carbazole or triphenylamine group substituted cyclometalated Ir(III) complexes for oxygen sensing. These probes demonstrate optimal luminescence dynamics for oxygen monitoring in the range of 0–100% oxygen levels when immobilized in an ethyl cellulose matrix. Importantly, the complex Ir(ppy-NPh₃)₂(acac) exhibits a longer luminescence lifetime (τ = 3.60 μs) and a higher oxygen sensitivity (I₀/I₁₀₀ = 15.0, K_SV = 0.02582 Torr⁻¹) compared with the other complexes.

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含咔唑/三苯胺供体片段的双环金属化铱（III）配合物用于氧传感

制备了基于 2-苯基吡啶 (ppy) 与咔唑或三苯胺分子的双环甲基化 Ir(III)配合物 Ir(ppy-Carbazole)2(acac) 和 Ir(ppy-NPh3)2(acac)（acac = 乙酰丙酮酸盐），并对其进行了表征和磷光材料测试。通过与未取代的母体 Ir(III)络合物 Ir(ppy)2(acac)进行比较，研究了这两种络合物的光物理特性。与未取代的母体 Ir(ppy)2(acac)相比，掺入了咔唑/三苯胺环化配体的络合物 Ir(ppy-Carbazole)2(acac) 和 Ir(ppy-NPh3)2(acac) 表现出更大的摩尔消光系数和更长的发光寿命。我们采用合理的设计策略，将ppy 单元与电子负载的咔唑或三苯胺段相结合，研究了咔唑或三苯胺基团取代的环甲基化 Ir(III) 复合物在氧传感方面的优点。当这些探针固定在乙基纤维素基质中时，它们在 0-100% 氧气浓度范围内的氧气监测中表现出最佳的发光动态。重要的是，与其他复合物相比，Ir(ppy-NPh3)2(acac)复合物的发光寿命更长（τ = 3.60 μs），氧灵敏度更高（I0/I100 = 15.0，KSV = 0.02582 Torr-1）。

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来源期刊

Transition Metal Chemistry 化学-无机化学与核化学

CiteScore

3.60

自引率

0.00%

发文量

审稿时长

1.3 months

期刊介绍： Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc. Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.