期刊
CHINESE JOURNAL OF POLYMER SCIENCE
卷 33, 期 5, 页码 783-791出版社
SPRINGER
DOI: 10.1007/s10118-015-1555-9
关键词
Direct arylation polycondensation; Alternating copolymers; Substituent effects; Chemical shift
资金
- National Natural Science Foundation of China [60976019, 61250016]
- Education Department Program [JA12069]
- Program for Innovative Research Team in Science and Technology in Fujian Province
Four thiophene derivatives were prepared by replacing the 3,4 positions of thiophene by -OCH3, -CH3, -COOCH3 and -CN, respectively. The polycondensations via direct arylation took place between the four thiophene derivatives and 2,7-dibromo-9,9-dioctylfluorene under six various catalytic conditions to investigate the substituent effects. The substituent can affect the electron cloud density of the active C-H bond, which can be monitored by the NMR chemical shift. The experimental results show that the reactivity decreases with increasing the chemical shift of active C-H bonds in the four thiophene derivatives, and thus can promote the direct arylation polycondensation. This phenomenon is explained by the electrophilic aromatic substitution (SEAr) mechanism. UV-Visible absorption and photoluminescence were studied to investigate the substituent effect on optical properties of the four copolymers. The results show that these alternating fluorene-thiophene copolymers with different substituents are good fluorescent materials and promising in PLED applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据