主链含三苯胺单元的聚苯乙炔的合成及其电致发光性能

采用4-甲基三苯胺的二醛基化合物分别与对、间、邻-二甲基苯的膦盐反应,制备了三种含三苯胺单元的聚苯乙炔类共聚物TPA-PPV、TPA-PmPV和TPA-PoPV。结果表明：TPA-PPV和TPA-PmPV具有良好的热稳定性和光电化学性能,该类共聚物不但具有良好的空穴传输性能,而且作为发光材料应用于发光器件时可以调制发光颜色。     

苯基取代聚苯撑乙烯的合成及其电致发光性能

聚苯撑乙烯(PPV)类聚合物是优异的发光材料, 有望作为全色显示中三基色的材料之一得到应用. 我们采用2-溴-1,4-亚二甲苯二乙酯为原料, 合成了商品名为Supper Yellow PPV (SY PPV)的苯基取代PPV. 中间体、单体和聚合物的结构都通过核磁共振、元素分析进行了表征. SY PPV的吸收峰在434 nm, 吸收边在510 nm, 带隙2.44 eV. 光致发光峰值和电致发光峰值分别在516和552 nm. SY PPV的器件性能为: 启动电压为2.4 V, 最大亮度大于49000 cd·m^-2, 最大流明效率为21 cd·A^-1, 显著优于采用老方法合成SY PPV的最大流明效率(16-18 cd·A^-1).     

Fluorinated molecules relevant to conducting polymer research

The synthesis of versatile fluorine compounds for conducting polymer research on fluorinated materials is presented. 1,2,4,5-Tetrafluorobenzene was converted to 1,2,4,5-tetrafluorobenzaldehyde (1) and protected as an acetal. This gave the acetals 1,2,4,5-tetrafluoro-3-(1,3-dioxol-2-yl)benzene (2a) and 1,2,4,5-tetrafluoro-3-(5,5-dimethyl-1,3-dioxan-2-yl)benzene (2b). Compounds 2a and 2b were converted into the semiprotected 2,3,5,6-tetrafluoroterephthaldehydes: 1,2,4,5-tetrafluoro-3-(1,3-dioxol-2-yl)-6-formylbenzene (3a) and 1,2,4,5-tetrafluoro-3-(5,5-dimethyl-1,3-dioxan-2-yl)-6-formylbenzene (3b). While 3a was easily deprotected to give 2,3,5,6-tetrafluoroterephthaldehyde (4) compound 3b proved very resilient to hydrolysis and gave a 1:1 mixture of 4 and 1,2,4,5-tetrafluoro-3,6-bis(5,5-dimethyl-1,3-dioxan-2-yl)benzene (5). Compound 4 was reduced to 1,2,4,5-tetrafluoro-3,6-dihydroxymethylbenzene (6) and converted into 1,2,4,5-tetrafluoro-3,6-dibromomethylbenzene (7). Compound 7 was finally converted into 1,2,4,5-tetrafluoro-3,6-bis(diethylphosponylmethyl)benzene (8). Compounds 4 and 8 are versatile fluorinated molecules that can be used to replace their hydrogen counterparts in many molecules and materials. To illustrate this compounds 4 and 8 were oligomerised to give partially fluorinated polyphenylenevinylene (9).     

New polyphenylene‐ and polyphenylenevinylene‐based copolymers containing triarylpyrazoline units in the main chains

Two novel polyphenylene and polyphenylenevinylene copolymers containing triarylpyrazoline units in the main chains were synthesized and characterized. The resulting copolymers were amorphous and showed excellent solubility in common organic solvents, such as dichloromethane, chloroform, 1,2‐dichloroethane, chlorobenzene, toluene, and THF. The polymers possessed good thermal stability with glass transition temperatures of 82 and 96 °C and decomposition onset temperatures of 295 and 309 °C, respectively. They exhibited good photoluminescence properties with high photoluminescence efficiencies. Double‐layered light‐emitting‐diode devices with an indium tin oxide/Poly(3,4‐ethylenedioxythiophene)/polymer/Ba/Al configuration could emit strong green light with external quantum efficiencies of0.53 and 0.92%. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 1632–1640, 2007