Molecular 5,8-π-extended quinoxaline derivatives as chromophores for photoluminescence applications.

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dc.contributor.authorAguiar, Leonardo de Oliveira
dc.contributor.authorLima Junior, Adalberto Santana
dc.contributor.authorBechtold, Ivan Helmuth
dc.contributor.authorCurcio, Sergio Fernando
dc.contributor.authorCazati, Thiago
dc.contributor.authorAlves, Tiago Vinicius
dc.contributor.authorVieira, André Alexandre
dc.date.accessioned2020-08-14T20:48:53Z
dc.date.available2020-08-14T20:48:53Z
dc.date.issued2019
dc.description.abstractThe 5,8-π-extended quinoxaline derivatives are widely studied due to their wellknown photophysical and electrochemical properties. In order to investigate the structure-property relationship, a novel series of fluorescent calamitic liquid crystals based on the quinoxaline heterocycle was successfully synthesized and characterized. The final molecules presented calamitic mesomorphism with nematic and smectic phases. These compounds displayed intense green photoluminescence under UV light excitation in solution and in the solid state. In chloroform solution, the fluorescence quantum yields (ΦFL= 0.54–0.62) of the quinoxaline-based derivatives were significantly higher than those previously described for similar benzothiadiazoles. The maximum emission peaks were between 511-520 nm with singlet excited-state lifetimes in the nanosecond timescale. The solvatochromism studies showed a significant dependence of the emission on the polarity of the solvent. Doping of the quinoxalines with fullerene C60 suggests a charge transfer process, this being dependent on the π-conjugate core. The energy band gaps predicted with DFT calculations are in excellent agreement with the experimental data.pt_BR
dc.identifier.citationAGUIAR, L. O. et al. Molecular 5,8-π-extended quinoxaline derivatives as chromophores for photoluminescence applications. Journal of Molecular Liquids, v. 296, n. 111763, dez. 2019. Disponível em: <https://www.sciencedirect.com/science/article/abs/pii/S0167732219332234>. Acesso em: 03 jul. 2020.pt_BR
dc.identifier.doihttps://doi.org/10.1016/j.molliq.2019.111763pt_BR
dc.identifier.issn0167-7322
dc.identifier.urihttp://www.repositorio.ufop.br/handle/123456789/12598
dc.identifier.uri2https://www.sciencedirect.com/science/article/abs/pii/S0167732219332234pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectLuminescencept_BR
dc.subjectLiquid crystalspt_BR
dc.subjectSynthesispt_BR
dc.titleMolecular 5,8-π-extended quinoxaline derivatives as chromophores for photoluminescence applications.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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