| Autor: |
Yoon, YoungSik, Park, KwangHan, Lee, JongChan |
| Zdroj: |
Macromolecular Chemistry and Physics; September 2009, Vol. 210 Issue: 18 p1510-1518, 9p |
| Abstrakt: |
Poly3thiopheneacetatedialkyldimethylammonium complexes PTACn were prepared by mixing regiorandom poly3thiopheneacetic acid with dialkyldimethylammonium bromide to study the effect of their selfassembled structures on the optical properties. The lengths of the alkyl groups in the ammonium salts were varied from decyl C10 to octadecyl C18 groups. These complexes showed fully developed layer structures with ordered mesophases. PTAC16 and PTAC18 with longer alkyl groups showed sidechain crystalline phases, and PTAC10, PTAC12, and PTAC14 with shorter alkyl groups showed sidechain crystalline and liquid crystalline phases at room temperature. When PTAC18 was heated, a melting transition from sidechain crystalline to smectic liquid crystalline phase was observed at 41.5 °C. The maximum absorption and emission wavelengths of these complexes increased with increasing alkyl chain length indicating that the πconjugated structure of the regiorandom thiophene backbone changes according to the alkyl groups. |
| Databáze: |
Supplemental Index |
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