Microwave Assisted Selective Synthesis of Mono and Bistriazines with Phenylenediamines as spacers. Study of their Optical Properties
A series of mono- and bistriazine derivatives were selectively prepared in high yields using microwave irradiation. Donor substituents were attached on the triazine ring, including pyrazolyl-substituted anilines and o-, m-, and pphenylenediamine as π-conjugated spacers. This method was used to build...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Universidad de Castilla-La Mancha |
| Repositorio: | RUIdeRA. Repositorio Institucional de la UCLM |
| OAI Identifier: | oai:ruidera.uclm.es:10578/38635 |
| Acceso en línea: | https://hdl.handle.net/10578/38635 |
| Access Level: | acceso embargado |
| Palabra clave: | Microwave, Triazine, Optoelectronic |
| Sumario: | A series of mono- and bistriazine derivatives were selectively prepared in high yields using microwave irradiation. Donor substituents were attached on the triazine ring, including pyrazolyl-substituted anilines and o-, m-, and pphenylenediamine as π-conjugated spacers. This method was used to build σ−π−σ−A−σ−D systems for monotriazines and D−σ−A−σ−π−σ−A−σ−D systems for bistriazines. A study of the optoelectronic properties was performed by UV−vis and fluorescence spectroscopy and cyclic voltammetry. The monotriazines do not show any emission, but the bistriazines are blue emitters and show an interesting solvatochromic effect with large Stokes shifts of more than 10 000 cm−1 in some cases and quantum yields up to 23%. The optoelectronic properties depend on the conjugation and the position and donor character of the substituents and spacers. Cyclic voltammetry was used to determine the energy levels (HOMO and LUMO) in the bistriazines. An increase in the energy of the HOMO and a decrease in the energy of the LUMO were observed upon extending the conjugation. The title compounds showed interesting properties for use in optoelectronic devices, especially as blue emitters. |
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