π‐Conjugated Chelating Polymers with Charged Iridium Complexes in the Backbones: Synthesis, Characterization, Energy Transfer, and Electrochemical Properties
π‐Conjugated Chelating Polymers with Charged Iridium Complexes in the Backbones: Synthesis, Characterization, Energy Transfer, and Electrochemical Properties
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DOI：
10.1002/chem.200501095
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发表时间：
2006-05
期刊：
影响因子：
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通讯作者：
Shu-juan Liu;Qiang Zhao;Run Chen;Yun Deng;Quli Fan;Fuyou Li;Lianhui Wang;Chunhui Huang;Wei H
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文献类型：
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作者：
Shu-juan Liu;Qiang Zhao;Run Chen;Yun Deng;Quli Fan;Fuyou Li;Lianhui Wang;Chunhui Huang;Wei H
通过Suzuki缩聚反应合成了一系列骨架中含有带电Ir(Ir)络合物的PI共轭螯合聚合物，得到了发光红光的均相聚合物材料。用荧烯和联吡啶(BPY)链段作为聚合物骨架。以5，5‘-二溴联吡啶为配体，以1-(9’，9-二辛基-2-基)异喹啉(FIQ)为环金属化配体，形成带电的Ir络合物单体。化学和光物理表征证实，Ir络合物通过5，5‘-二溴联吡啶配体作为重复单元被引入到骨架中。当投料比为2mol%时，络合聚合物在固体状态下表现出从主体荧链到客体Ir络合物的能量几乎完全传递。然而，在相应的共混体系的薄膜中，即使Ir络合物的含量高达16mol%，能量转移也不完全。该主客体体系中既存在分子内能量转移过程，也存在分子间能量转移过程，其中分子内能量转移过程更为有效。所有的螯合聚合物都表现出良好的热稳定性、氧化还原可逆性和成膜性。这些螯合聚合物还表现出比相应的共混体系更有效的能量转移，并且带电的Ir络合物被掺入到PI共轭聚合物主链中的机制有效地避免了与共混体系相关的固有问题，因此在光电子学应用中具有广阔的前景。
A series of pi-conjugated chelating polymers with charged iridium (Ir) complexes in the backbones were synthesized by a Suzuki polycondensation reaction, leading to homogeneous polymeric materials that phosphoresce red light. The fluorene and bipyridine (bpy) segments were used as polymer backbones. 5,5'-Dibromobipyridine served as a ligand to form a charged iridium complex monomer with 1-(9'9-dioctylfluorene-2-yl)isoquinoline (Fiq) as the cyclometalated ligand. Chemical and photophysical characterization confirmed that Ir complexes were incorporated into the backbones as one of the repeat units by means of the 5,5'-dibromobipyridine ligand. Chelating polymers showed almost complete energy transfer from the host fluorene segments to the guest Ir complexes in the solid state when the feed ratio was 2 mol %. In the films of the corresponding blend system, however, energy transfer was not complete even when the content of Ir complexes was as high as 16 mol %. Both intra- and intermolecular energy-transfer processes existed in this host-guest system, and the intramolecular energy transfer was a more efficient process. All chelating polymers displayed good thermal stability, redox reversibility, and film formation. These chelating polymers also showed more efficient energy transfer than the corresponding blended system and the mechanism of incorporation of the charged Ir complexes into the pi-conjugated polymer backbones efficiently avoided the intrinsic problems associated with the blend system, thus offering promise in optoelectronic applications.