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首页> 外文期刊>RSC Advances >The influence of molecular structure on collision radius for optical sensing of molecular oxygen based on cyclometalated Ir(iii) complexes
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The influence of molecular structure on collision radius for optical sensing of molecular oxygen based on cyclometalated Ir(iii) complexes

机译：基于环级IR（III）复合物的分子氧光学感应分子结构对碰撞半径的影响

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摘要

Three triphenylamine (TPA) substituted cyclometalated Ir(iii) complexes IrA1, IrA2, and IrA3 based on Ir(ppy)(3) were synthesized and applied as phosphorescent probes for the monitoring of molecular oxygen. The phosphorescence intensity of all the Ir(iii) complexes in tetrahydrofuran (THF) was gradually quenched with an increase of oxygen concentration. The increase of TPA substituents on the meta-position of 2-phenylpyridine (IrA1-IrA3) gradually improved the oxygen sensitivity of cyclometalated Ir(iii) complexes. IrA3 showed the highest oxygen sensitivity in THF with a KappSV of 204.8 bar(-1) and a limit of detection (LOD) of 0.27 mbar. The relationship between molecular structure and the collision radiuses (sigma) of all the Ir(iii) complexes has been investigated on the basis of the Demas model and the fundamental expression of luminescence quenching systems by oxygen. The ratio of collision radiuses are sigma(IrA1)/sigma(Ir(ppy)3) = 1.27 +/- 0.05, sigma(IrA2)/sigma(Ir(ppy)3) = 1.72 +/- 0.10, and sigma(IrA3)/sigma(Ir(ppy)3) = 2.13 +/- 0.07, respectively. The introduction and increase of TPA substituents can obviously increase the collision radiuses of cyclometalated Ir(iii) complexes which leading to potential oxygen sensitivity. And the incremental effect of collision radiuses caused by the introduction of TPA substituents resulted in outstanding oxygen sensitivity of IrA3. The results demonstrate for the first time evidence between molecular structure and oxygen sensitivity of the emitters for optical sensing.
机译：三个三苯基胺（TPA）取代的环金属化铱（III）配合IrA1，IrA2和IrA3基于的Ir（ppy）（3）的合成和作为磷光探针应用于分子氧的监测。的所有的铱（III）的四氢呋喃（THF）复合物的增加的氧浓度的逐渐淬灭磷光强度。的TPA取代基上2-苯基吡啶（IrA1-IrA3）的间位的增加而逐渐改善环金属的Ir（III）络合物的氧敏感性。 IrA3表明在THF与0.27毫巴204.8巴（-1）和检测（LOD）的限制的KappSV最高氧敏感性。分子结构和所有的铱（III）配合物的碰撞半径（SIGMA）之间的关系进行了研究的底马模型和氧发光猝灭系统的基本表达的基础上。碰撞半径的比率是西格马（IrA1）/西格玛（的Ir（ppy）3）= 1.27 +/- 0.05，西格马（IrA2）/西格玛（的Ir（ppy）3）= 1.72±0.10，和西格马（IrA3 ）/西格玛分别（的Ir（ppy）3）= 2.13±0.07。引进和TPA取代基增加可以明显增加铱环金属（III）配合物，其导致潜在的氧敏感性的碰撞半径。并且由于引入的取代基TPA碰撞半径的增量影响导致IrA3优秀氧敏感性。结果证明为分子结构和发射器用于光学感测的氧气灵敏度之间的第一时间的证据。

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  • 来源
    《RSC Advances》 |2018年第71期|共8页
  • 作者

    Di Ling; Xing Yang; Wang Xiaoning; Zheng Daoyuan; Yang Yang; Li Fayun;

  • 作者单位

    Liaoning Shihua Univ Coll Chem Chem Engn &

    Environm Engn Fushun 113001 Peoples R China;

    Liaoning Shihua Univ Coll Chem Chem Engn &

    Environm Engn Fushun 113001 Peoples R China;

    Liaoning Shihua Univ Coll Chem Chem Engn &

    Environm Engn Fushun 113001 Peoples R China;

    Chinese Acad Sci Dalian Inst Chem Phys State Key Lab Mol React Dynam Dalian 116023 Peoples R China;

    Chinese Acad Sci Dalian Inst Chem Phys State Key Lab Mol React Dynam Dalian 116023 Peoples R China;

    Liaoning Shihua Univ Coll Chem Chem Engn &

    Environm Engn Fushun 113001 Peoples R China;

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  • 中图分类 化学;
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