Novel Fluorescent Carbazolyl−Pyridinyl Alternating Copoloymers: Synthesis, Characterization, and Properties
作者:Xiaoyong Pan、Shouping Liu、Hardy S. O. Chan、Siu-Choon Ng
DOI:10.1021/ma050425b
日期:2005.9.1
A novel series of AB-type polymers comprised of alternating carbazolyl and pyridinyl units were synthesized using palladium(0)-catalyzed Suzuki cross-coupling reaction in good to high yields. In this series of alternating copolymers, the electron-rich 2,7-(N-(2-ethylhexyl)carbazolyl) unit was used as a light-emitting unit, and the electron-deficient unit of pyridinyl was introduced to tune the wavelength
使用钯(0)催化的Suzuki交叉偶联反应以良好至高收率合成了由咔唑基和吡啶基单元交替组成的一系列新型AB型聚合物。在这一系列交替共聚物中,将富电子的2,7-(N-(2-乙基己基)咔唑基)单元用作发光单元,并引入吡啶基的缺电子单元来调节发光并改善其电子传输。这些聚合物的特征在于1 H NMR和13C NMR,凝胶渗透色谱(GPC),热分析,UV-vis,荧光光谱和循环伏安法(CV)。这些聚合物的玻璃化转变温度范围为120至150°C,并且在氮气中,聚合物的分解温度范围为370-400°C,显示出高的热稳定性。共聚物主链中吡啶基单元的不同连接方式对溶液相和薄膜相中的电子和光学性质有重大影响。对于纯蓝色发射并防止聚合物链的聚集,聚合物主链中吡啶基单元的间位键状结构(3,5-和2,6-键)比对位键状结构(2,5-吡啶基单元)。N-辛基]咔唑基]及其衍生物呢。7a