Synthesis and electronic properties of pyridine end capped cyclopentadithiophene-vinylene oligomers
| Autor: | Latha Venkataraman, Fernando G. Guijarro, Rocío Ponce Ortiz, Samara Medina Rivero, Fernando Langa, Suman Gunasekaran, Rubén Caballero, Juan Casado, Pilar de la Cruz, Iratxe Arretxea |
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| Rok vydání: | 2020 |
| Předmět: |
optical properties
General Chemical Engineering cyclopentadithiophene-vinylenes Electron delocalization Protonation General Chemistry Conjugated system Resonance (chemistry) chemistry.chemical_compound chemistry Polymer chemistry Pyridine Trifluoroacetic acid Molecule trifluoroacetic acid (TFA) Electronic properties |
| Zdroj: | RUIdeRA. Repositorio Institucional de la UCLM instname |
| Popis: | A series of four oligomers of cyclopentadithiophene-vinylenes end capped with pyridine groups was prepared and their optical and electronic properties studied. Treatment with trifluoroacetic acid (TFA) leads to the bisprotonation of the nitrogens of the pyridine, which has an important impact on the optical properties. Excess treatment with TFA provokes the oxidation of the conjugated core, generating radical cations and dications. The ease of the TFA treatment in solution was extended to protonation in the solid-state where further characterization of the neutral and TFA-treated samples was carried out in electrically active substrates in organic field-effect transistors. Finally, the new molecules were found to be excellent conductors in single-molecule junctions thanks to strong electron delocalization and resonance orbital mediated transport. These studies show the opening of a spectrum of possibilities by suitable terminal substitution of π-cores. |
| Databáze: | OpenAIRE |
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