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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Photoswitchable azobenzene-appended iridium(III) complexes
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Photoswitchable azobenzene-appended iridium(III) complexes

机译：光开关偶氮苯加铱（III）配合物

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摘要

Iridium(III) cyclometalated complexes have been used as models to study the effect that extended conjugation and substitution pattern has on the photochromic behavior of azobenzene-appended 2-phenyl-pyridyl (ppy) ligands. For this purpose four azobenzene-containing ppy ligands were synthesized. With these ligands, nine iridium(III) complexes containing up to three appended azobenzenes were synthesized. Analysis of their photochromic behaviour by means of UV-vis and H-1-NMR spectroscopy permitted us to conclude that the light-induced trans-to-cis isomerization of the azobenzene was strongly inhibited upon coordination to the Ir(III) cation when the electronic conjugation was extended along the whole ligand. The use of an aliphatic spacer unit (either -CH2- or -OCH2-) between the azobenzene and the ppy fragment of the ligand sufficed to disrupt the electronic communication, and obtain photochromic organometallic complexes.
机译：铱（III）环金属化的络合物已被用作模型来研究扩展的共轭和取代模式对偶氮苯附加的2-苯基-吡啶基（ppy）配体的光致变色行为的影响。为此目的，合成了四个含偶氮苯的ppy配体。利用这些配体，合成了含有最多三个附加的偶氮苯的九种铱（III）配合物。借助紫外可见光谱和H-1-NMR光谱对它们的光致变色行为进行分析，我们可以得出结论，当苯甲酸酯与Ir（III）阳离子配位时，光诱导的偶氮苯反式-顺式异构化受到了强烈抑制。电子共轭沿整个配体延伸。在偶氮苯和配体的ppy片段之间使用脂族间隔单元（-CH 2-或-OCH 2-）足以破坏电子通讯，并获得光致变色有机金属配合物。

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