Highly Branched Polyphenylenes with 1,3,5-Triphenylbenzene Fragments via Cyclocondensation of Acetylaromatic Compounds and Ni<sup>0</sup>-Catalyzed Dehalogenation: Synthesis and Light Emission
作者:Irina A. Khotina、Olga E. Shmakova、Diana Yu. Baranova、Natalia S. Burenkova、Anastasia A. Gurskaja、Peter M. Valetsky、Lyudmila M. Bronstein
DOI:10.1021/ma0347114
日期:2003.11.1
Highly branched photoluminescent polyphenylenes (PP) containing 1,3,5-triphenylbenzene (TPB) fragments were prepared via combination of cyclocondensation of acetylaromatic compounds and Ni0-catalyzed dehalogenation. To develop optimal conditions for cyclocondensation of acetylaromatic compounds, we studied a model reaction of 1,3,5-triphenylbenzene formation using different solvents and catalysts.
通过结合乙酰芳族化合物的环缩合反应和Ni 0催化的脱卤反应,制备了含1,3,5-三苯苯(TPB)片段的高度支化的光致发光聚亚苯基(PP)。为了开发乙酰基芳香族化合物环缩合的最佳条件,我们研究了使用不同溶剂和催化剂形成1,3,5-三苯苯的模型反应。使用H 2 SO 4可达到TPB的最大85%的收率作为催化剂,在乙醇-甲苯介质中于50°C加热5小时。在等摩尔量的苯乙酮存在下(在相对于可溶性聚合物收率而言最佳的条件下),4,4'-二乙酰基二苯醚或4,4'-二乙酰基苯的环缩聚反应不会产生光致发光PP,这是因为其存在各种缺陷。聚合物链。Ni 0催化的1,3,5-tri(p-溴苯基)苯。聚合物的分子量为6700和8600Da。对于具有星形TPB片段,不带Br或乙酰基的高度支化的聚合物,溶液的最大光致发光(量子产率为96%)获得了。这种PP在360 nm的紫外线照射下在固态下也显示出非常明亮的荧光,因此