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| Content Provider | Springer Nature Link |
|---|---|
| Author | Sun, Min min Wang, Wen Liang, Lu ying Yan, Shu hui Zhou, Ming lu Ling, Qi dan |
| Copyright Year | 2015 |
| Abstract | 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. |
| Starting Page | 783 |
| Ending Page | 791 |
| Page Count | 9 |
| File Format | |
| ISSN | 02567679 |
| Journal | Chinese Journal of Polymer Science |
| Volume Number | 33 |
| Issue Number | 5 |
| e-ISSN | 14396203 |
| Language | English |
| Publisher | Chinese Chemical Society and Institute of Chemistry, CAS |
| Publisher Date | 2015-03-19 |
| Publisher Place | Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Direct arylation polycondensation Alternating copolymers Substituent effects Chemical shift Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials Condensed Matter Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Chemical Engineering Polymers and Plastics |
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