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5 mar 2024 · The auxochromic effect of the different substituents on the UV-Vis spectrum relative to alizarin will be analyzed by quantifying the changes in the relative positions of the ground and lowest excited electronic states.
1 maj 2022 · The simulated absorption spectrum of the Alizarin dye exhibited two maxima at 240 nm and 431 nm in the UV and visible range, respectively. A good qualitative agreement between the experiment and the TD-DFT calculations was observed.
1 wrz 2024 · As we have seen, the limited solubility of alizarin in water can pose challenges when measuring their experimental UV–Vis and NMR spectra due to the potential formation of precipitates. To address this concern, a more soluble analogue, alizarin red S, has been studied.
31 sty 2022 · While the three UV-vis absorption spectra share the same general shape, it turns out that adding electron donating hydroxyl groups is shifting the spectrum from near UV (9,10-anthraquinone) to visible (alizarin: violet, purpurin: blue).
For such, we have performed a comprehensive study of electronic effects of substituents in position C 3 of alizarin by means of a time dependent DFT approach. These auxochromes attached to the chromophore are proven to alter both the wavelength and intensity of absorption.
affecting the dominant absorption in the UV-Vis spectra of alizarin and alizarin Red S, we investigate how the electronic structure of the ground state and the lowest energy excited
1 kwi 2014 · UV–Vis spectra for 1 recorded in liquid ACN solution (a) and in the solid phase (b). Original experimental spectra are shown as heave black lines, while Gaussian components as blue lines. Contribution of tautomers is shown as light gray lines.
