Oxidative Stability and Its Effect on the Photoluminescence of Poly(Fluorene) Derivatives: End Group Effects
Oxidative Stability and Its Effect on the Photoluminescence of Poly(Fluorene) Derivatives: End Group Effects
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DOI：
10.1021/cm981049v
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发表时间：
1999-03
影响因子：
8.6
通讯作者：
J. Lee;G. Klaerner;Robert D. Miller
中科院分区：
文献类型：
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作者：
J. Lee;G. Klaerner;Robert D. Miller
通过Ni（0）催化聚合，合成了2-芴基、9，9-二正己基-2-芴基和9-芴酮-2-基封端的聚（9，9-二烷基芴-2，7-二基）衍生物。这些聚合物的吸收和发射光谱测量退火后，在升高的温度在空气中作为退火时间的函数。用2-溴-9，9-二正己基芴封端的聚合物的荧光稳定性比用2-溴芴封端的聚合物好得多。通过π-堆积和端基化学氧化成芴酮的组合，合理化了用2-芴基取代基封端的聚合物对空气中热退火的发光的异常敏感性。后者证明了退火膜的红外光谱和比较的结果与吸收，发射，和红外光谱的聚合物故意封端使用2-溴-9-芴酮。本研究主要是对染料的颜色稳定性进行研究。
Poly(9,9-dialkylfluorene-2,7-diyl) derivatives end-capped with 2-fluorenyl, 9,9-di-n-hexyl-2-fluorenyl, and 9-fluorenone-2-yl substituents have been synthesized through Ni(0)-mediated polymerization. Absorption and emission spectra of these polymers were measured after annealing at elevated temperatures in air as a function of annealing time. The fluorescence stability of the polymers end-capped using 2-bromo-9,9-di-n-hexylfluorene was much better than for the polymers end-capped with 2-bromofluorene. The exceptional sensitivity of the luminescence of the polymers end-capped with 2-fluorenyl substituents to thermal annealing in air is rationalized by a combination of π-stacking and chemical oxidation of the end groups to fluorenones. The latter was demonstrated by the IR spectra of annealed films and comparison of the results with the absorption, emission, and IR spectra of the polymers deliberately end-capped using 2-bromo-9-fluorenone. This study is directed toward the investigation of color stability o...