2-Aryl-5-amino-1,2,3-triazoles: New effective blue-emitting fluorophores
摘要:
The synthesis of a new series of 2-aryl-5-amino-1,2,3-triazole derivatives is reported. The photochemical properties of these new fluorophores were studied both experimentally and using theoretical models. The compounds were found to be fluorescent, with Stokes shifts ranging from 40 nm (2494 CM-1) to 140 nm (9461 cm(-1)) and quantum yield values between 0.004 and 0.996. The fluorescence of the 1,2,3-triazoles was highly structure dependent and could be tuned by variation of the substituents at the C-4 and C-5 atoms of triazole ring and by the electronic and spatial effect of substituents within the aromatic cycle. Photophysical studies showed moderate changes in the fluorescence quantum yields depending on the solvent polarity. The UV-Vis spectra calculations employing the time-dependent density functional theory (TD-DFT) are in good agreement with the experimental data. The favourable photophysical properties of the studied compounds and their facile and high-yielding synthesis make them excellent candidates for commercial application as fluorescent tags. (C) 2016 Elsevier Ltd. All rights reserved.
DOI:
10.1016/j.dyepig.2016.08.015
作为产物:
描述:
4-氰基重氮苯四氟硼酸盐 、 丙二腈 在
sodium acetate 、 silica gel 作用下,
以
neat (no solvent) 为溶剂,
反应 0.5h,
以92%的产率得到2-[2-(4-cyanophenyl)hydrazono]malononitrile
each synthesized compound in these two solvents. By changing the solvent from CHCl3 to DMSO, the E/Z ratios decreased. The results demonstrated that the ΔG° values for the formation of Zisomers were more negative than those of the Eisomers in DMSO. This is why Zisomers are more stable than Eisomers in DMSO. The results of density functional theory (DFT) calculations at B3LYP/6–311++G (d,p) level
报道了一种通过芳基重氮硅硫酸盐纳米复合材料与丙二腈、乙酰乙酸乙酯和二甲酮反应来合成一系列芳基腙的快速有效方法。所有反应均在室温下在水中进行,相应的产物以 77-87% 的产率获得。使用乙酰乙酸乙酯合成的芳基腙中存在两种分子内氢键,使这些化合物能够通过围绕腙C N 键旋转而转换,从而导致它们的E和Z构型之间的可逆异构化。这种转换可以通过改变溶剂的极性来控制。在 CHCl 3 中研究了每种合成化合物的E/Z比和二甲基亚砜。E/Z的比率是使用1 H NMR 数据在 CDCl 3和 DMSO- d 6中计算的,并用于计算每种合成化合物在这两种溶剂中的EZ异构化的ΔG ° 。通过将溶剂从 CHCl 3改为 DMSO,E/Z比降低。结果表明,在 DMSO 中形成Z异构体的 Δ G ° 值比E异构体的更负。这就是为什么Z异构体比E更稳定DMSO 中的异构体。B3LYP/6–311++G (d,p) 理论水平的密度泛函理论
Effect of new carbonyl cyanide aromatic hydrazones on biofilm inhibition against methicillin resistant <i>Staphylococcus aureus</i>
and 1.56 μM, respectively). Somecompounds in combination with antibiotics exhibited potentiate Gram-positive antibacterial activity; compound 2e was found to display unaided or synergistic efficacy against MRSA. In particular, when compound 2e is combined with ofloxacin, it has a good synergistic effect against MRSA. Moreover, electron microscopy revealed that compound 2e inhibits biofilm formation
2-Aryl-5-amino-1,2,3-triazoles: New effective blue-emitting fluorophores
作者:Kseniya D. Gavlik、Ekaterina S. Sukhorukova、Yuri M. Shafran、Pavel A. Slepukhin、Enrico Benassi、Nataliya P. Belskaya
DOI:10.1016/j.dyepig.2016.08.015
日期:2017.1
The synthesis of a new series of 2-aryl-5-amino-1,2,3-triazole derivatives is reported. The photochemical properties of these new fluorophores were studied both experimentally and using theoretical models. The compounds were found to be fluorescent, with Stokes shifts ranging from 40 nm (2494 CM-1) to 140 nm (9461 cm(-1)) and quantum yield values between 0.004 and 0.996. The fluorescence of the 1,2,3-triazoles was highly structure dependent and could be tuned by variation of the substituents at the C-4 and C-5 atoms of triazole ring and by the electronic and spatial effect of substituents within the aromatic cycle. Photophysical studies showed moderate changes in the fluorescence quantum yields depending on the solvent polarity. The UV-Vis spectra calculations employing the time-dependent density functional theory (TD-DFT) are in good agreement with the experimental data. The favourable photophysical properties of the studied compounds and their facile and high-yielding synthesis make them excellent candidates for commercial application as fluorescent tags. (C) 2016 Elsevier Ltd. All rights reserved.
Mechanically Activated Solid-State Synthesis of Phenylhydrazone Derivatives via High-Speed Ball Milling
作者:Xingyi Zhu、Yuanyuan Chen、Yuhe Chen、Jue Wang、Weike Su
DOI:10.2174/1570178611999140404111411
日期:2014.6
A series of phenylhydrazone derivatives was synthesized from arenediazonium tetrafluoroborates and active methylene compounds under high-speedballmilling. The reaction occurred in the absence of the solvent and products were obtained in good yield within short reaction times (no more than 30 min).