Synthesis and Spectral Characteristics of Novel Fluorescent Dyes Based on Pyrimido[4,5‐d] [1,2,4]triazolo[4,3‐a]pyrimidine |
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| Authors: | Manijeh Mohadeszadeh Mohammad Rahimizadeh Hossein Eshghi Ali Shiri Mostafa Gholizadeh Alireza Shams |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, 91775?–?1436 Mashhad, Iran , (phone: +98‐51‐38797022;2. fax: +98‐51‐38796416) |
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| Abstract: | Different derivatives of a novel heterocyclic system, i.e., pyrimido[4,5‐d] [1,2,4]triazolo[4,3‐a]pyrimidine, are synthesized in moderate‐to‐good yields. These compounds exhibit excellent photochromism upon photoirradiation. The photophysical characterizations of these new compounds were evaluated by UV/VIS absorption and fluorescence emission studies. The emission spectra in various solvents are also presented and discussed. The changes are due to the intramolecular H‐bonding of pyrimido‐triazolo‐pyrimidine with H2O, and photoinduced electron and general solvent effect. These compounds display high fluorescence quantum yields and are reported as new fluorophores. |
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| Keywords: | Pyrimido[4,5‐d] [1,2,4]triazolo[4,3‐a]pyrimidine Heterocyclization Fluorescence Quantum yield UV/VIS Absorption |
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