Detalhes bibliográficos
| Resumo: | A series of novel substituted-azo dyes 8-(aryldiazenyl)quinolin-5-ol (5a-i) were synthesized by the coupling reaction of 5-hydroxyquinoline with diazotized aniline derivatives in the presence of NaNO2 in HCl/H2O mixture. The study of the spectroscopic and solvatochromic properties were performed by FT-IR, 1H and 13C-NMR and UV-Visible spectroscopies. The tautomerism of these dyes was studied using the deuteration technique and solvatochromic measurements. Photochromic properties of these 5-hydroxyquinoline azo dyes were also examined via E/Z and Z/E photochemical isomerization reactions and compared with the existing 8-hydroxyquinoline analogous. The novel substituted-azo dyes exhibited higher Z/E thermal isomerization rates and have larger absorbance wavelength range than their 8-hydroxyquinoline analogous, making them potential molecular switches. |
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| Autores principais: | Rashidnejad, Hamid |
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| Outros Autores: | Ramezanitaghartapeh, Mohammad; Pesyan, Nader Noroozi; Mahon, Peter J.; Raposo, M. Manuela M.; Coelho, Paulo J.; Lup, Andrew Ng Kay; Soltani, Alireza |
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| Assunto: | 5-hydroxyquinoline 8-hydroxyquinoline Heterocyclic azo dyes Photochromism Solvatochromism Tautomerism |
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| Ano: | 2021 |
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| País: | Portugal |
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| Tipo de documento: | artigo |
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| Tipo de acesso: | acesso aberto |
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| Instituição associada: | Universidade do Minho |
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| Idioma: | inglês |
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| Origem: | RepositóriUM - Universidade do Minho |
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