Manipulation of Chain Conformation for Optimum Charge-Transport Pathways in Conjugated Polymers
| Autor: | Wi Hyoung Lee, Sung Dong Kim, Bong-Gi Kim, Jung Hun Lee, Dong Ryeol Whang, Hui Joon Park, Bonghyun Jo, Tae Kyu Ahn, Seolhee Jeon, Jai Il Park |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Chemical structure Stacking 02 engineering and technology Polymer Conjugated system Dihedral angle 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Crystallography Planar chemistry Chain (algebraic topology) Polymerization Polymer chemistry General Materials Science 0210 nano-technology |
| Zdroj: | ACS applied materialsinterfaces. 9(27) |
| ISSN: | 1944-8252 |
| Popis: | A pair of different diketopyrrolopyrrole-based conjugated polymers (CPs) were designed and synthesized to investigate the effect of chain conformation on their molecular assembly. Conformation management was achieved by the incorporation of different linkers during polymerization. Through the use of computational calculations and UV-vis absorption measurements, the resulting CPs (PDPP-T and PDPP-BT) were found to exhibit partly modulated chain geometry. Grazing incident X-ray diffraction experiments with a two-dimensional detector revealed that PDPP-T having a planar chain conformation exhibited an edge-on type molecular arrangement, which evolved to a face-on type chain assembly when the planar geometry was altered to a slightly twisted one as in PDPP-BT. In addition, it was verified that the directional electric carrier mobility of CPs was critically distinguished by the distinctive chain arrangement in spite of their similar chemical structure. Concentration-dependent absorption measurements could provide an improved understanding of the assembly mechanism of CP chains: the planar conformation of PDPP-T facilitates the formation of preassembled chains in a concentrated solution and further directs the edge-on stacking, while the twisted dihedral angle along the benzothiophene in PDPP-BT prevents chain assembly, resulting in the face-on stacking. Because CP chain conformation is inevitably connected with the generation of preassembled chains, manipulating CP geometry could be an efficient tool for extracting an optimum chain assembly that is connected with the principal charge-transport pathway in CPs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|