Synthesis of Hypervalent Gallium(III) Complexes and Their Ability to Turn-On Luminescent Sensors for Lewis Bases

IF 7.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Chiaki Hotta, Masashi Nakamura, Masayuki Gon, Kazuo Tanaka
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Abstract

The introduction of main-group elements into the π-conjugated systems enables the modulation of optical properties based on changes in the coordinated state of the elements, and the use of heavy elements with high Lewis acidity is expected to broaden the range of coordination response. In this study, focus is placed on hypervalent gallium azobenzene complexes with variable coordination motifs because of a wide accessible space around gallium. The six-, five-, and four-coordinated gallium azobenzene complexes are isolated with pyridine ligands, and it is observed that the coordination of pyridine can dynamically change in the solution. Interestingly, the enhancement of the absolute fluorescence quantum yields is observed by the suppressing structural relaxation as increasing the coordination number. Furthermore, it is found that the emission efficiency is enhanced as increasing donor number which represents the strength of Lewis basicity. Finally, it is demonstrated that the filter paper soaked by the synthesized gallium complex is prepared, and it worked as a turn-on luminescent sensor to easily visualize strength of Lewis basicity of solvents by simply dropping the solvent on the paper. The findings are valuable for the development of designable and controllable stimuli-responsive materials focusing on the inherent properties of the main-group elements and π-conjugated systems.

Abstract Image

高价镓(III)配合物的合成及其对路易斯碱发光传感器的开启能力
在π共轭体系中引入主族元素,可以根据元素配位态的变化来调制光学性质,而使用具有高刘易斯酸度的重元素有望拓宽配位响应的范围。在这项研究中,重点放在具有可变配位基序的高价镓偶氮苯配合物上,因为镓周围有广阔的可达空间。用吡啶配体分离出六、五、四配位偶氮苯镓配合物,观察到吡啶配位在溶液中发生动态变化。有趣的是,随着配位数的增加,可以抑制结构弛豫,从而观察到绝对荧光量子产率的增强。此外,研究发现,随着施主数的增加,发射效率提高,施主数代表路易斯碱度的强度。最后,证明了合成的镓配合物浸渍的滤纸可以作为一个开启发光传感器,只需将溶剂滴在纸上,就可以很容易地看到溶剂的刘易斯碱度强度。研究结果对研究主族元素和π共轭体系的固有性质,开发可设计可控的刺激响应材料具有重要意义。
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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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