文章摘要
含2,3-二(5′-辛基噻吩基)喹喔啉单元荧光聚合物的合成及性能
Synthesis and Properties of Fluorescent Polymers Containing 2,3-Bis(5-octylthienyl)quinoxaline Unit
  
DOI:10.16865/j.cnki.1000-7555.2018.08.002
中文关键词: 噻吩  喹喔啉  碳碳偶联  荧光聚合物
英文关键词: thiophene  quinoxaline  C-C coupling reaction  fluorescent polymer
基金项目:国家自然科学基金资助项目(21164011);新疆大学博士启动基金(BS150233)
作者单位
李秀菊,阿布都克尤木·阿布都热西提,拜合提亚·艾海提,买苏尔·米吉提,吐尼莎古丽·阿吾提 新疆大学化学化工学院 石油天然气教育部重点实验室 功能高分子重点实验室新疆 乌鲁木齐 830046 
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中文摘要:
      以二价钯配合物作为催化剂,通过Sonogashira或Suzuki碳碳偶联反应制备了3种含2,3-二(5′-辛基噻吩基)喹喔啉单元的聚苯撑乙炔类(P1)、聚芴类(P2)和聚咔唑类(P3) π-共轭荧光聚合物。经傅里叶变换红外光谱、核磁共振氢谱和X射线粉末衍射对其结构进行了表征。利用紫外-可见光谱、荧光光谱和循环伏安等测试手段对其光学与电化学性能进行了研究,并研究了聚合物在CHCl3-CF3COOH溶液中的酸致变色行为。结果表明,3种聚合物在氯仿溶液和薄膜状态下的长波长处的紫外-可见最大吸收峰分别出现在449 nm、420 nm、418 nm和538 nm、425 nm和420 nm处。3种聚合物在氯仿溶液和薄膜状态下的荧光发射峰分别出现在556 nm、529 nm、558 nm和599 nm、556 nm、569 nm处,其在薄膜状态下分别发深红色、亮黄色和橙红色荧光。聚合物的相对荧光量子效率分别为18.1%、26.6%和16.8%。与P1和P3相比,P2显示较好的酸致变色行为,并在三氟乙酸浓度范围为2.692×10-3~40.38×10-3mol/L之间表现出酸浓度与吸光度之间优良的线性关系。通过循环伏安测试,聚合物均具有一定的空穴传输行为。
英文摘要:
      π-Conjugated fluorescent polymers containing 2,3-bis(5-octylthienyl) quinoxaline as poly(phenylene ethynylene)s (P1), polyfluorenes (P2) and polycarbazoles (P3) were prepared by Sonogashira or Suzuki C-C coupling reactions using Pd(Ⅱ) complex as catalyst. The structures of copolymers were characterized by Fourier translation infrared spectroscopy (FT-IR), 1H-nuclear magnetic resonance (1H-NMR) and X-ray diffraction analysis (XRD). Optical and electrochemical properties of copolymers were performed by ultraviolet and visible spectrophotometry (UV-vis), fluorescence spectroscopy (PL) and cyclic voltammogram (CV), and acidichromic properties of all copolymers were studied in CHCl3-CF3COOH solution. The results show that the maximum absorptions of copolymers at long wavelength appear at 449 nm, 420 nm and 418 nm in CHCl3 solution, and 538 nm, 425 nm, 420 nm in film state, respectively. The maximum emission peaks of copolymers appear at 556 nm, 529 nm and 558 nm in CHCl3 solution and 599 nm, 556 nm and 569 nm in film state. These copolymers emit deep red, bright yellow and orange red fluorescence in film state. The relative PL quantum yields of copolymers are 18.1%, 26.6% and 16.8%, respectively. Comparing with P1 and P3, copolymer P2 displays better acidochromic sensitivity and linear relationship between absorbance and concentration with the concentration of CF3COOH from 2.692×10-3 mol/L to 40.38×10-3 mol/L. Electrochemical behaviors of polymers depict some hole-transporting properties.
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