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• W2079887912 endingPage "99" @default.
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• W2079887912 abstract "► A novel azo dye (HQD) was synthesized and characterized by spectroscopic methods. ► Optical–vibrational properties were determined by experimentally and theoretically. ► The azo tautomeric form of HQD was found to be more stable than hydrazone form. ► Two important hydrogen bondings were determined as intramolecular interactions. ► The azo form and hydrogen bondings were supported by calculations and measurements. Novel acid mono azo dye, 2-[( E )-(8-hydroxyquinolin-5yl)-diazenyl]-4,5-dimethoxybenzoic acid (HQD), was synthesized by coupling diazonium salt solution of 2-amino-4,5-dimethoxybenzoic acid (DMA) with 8-hydroxyquinoline (HQ). This dye was characterized by UV–vis, IR & Raman, 1 H and 13 C NMR spectroscopic techniques and elemental analysis. The normal coordinate analysis of HQD was also performed to assign each band in vibrational spectra. DFT (B3LYP and B3PW91) calculations were employed to optimize the geometry, to interpret NMR spectra, to calculate and to determine the stable tautomeric structure of the compound. Natural Bond Orbital (NBO) analysis was performed to investigate intramolecular interactions. The vibrational spectral data obtained from solid phase IR & Raman spectra were assigned based on the results of the theoretical calculations. UV–vis spectroscopic technique was employed to obtain the optical band gap of HQD. The analysis of the optical absorption data revealed the existence of direct and indirect transitions in the optical band gaps. The optical band gaps of HQD have been found 1.95 and 1.90 eV for direct and indirect transitions, respectively." @default.
• W2079887912 created "2016-06-24" @default.
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• W2079887912 date "2012-11-01" @default.
• W2079887912 modified "2023-10-03" @default.
• W2079887912 title "Novel acid mono azo dye compound: Synthesis, characterization, vibrational, optical and theoretical investigations of 2-[(E)-(8-hydroxyquinolin-5-yl)-diazenyl]-4,5-dimethoxybenzoic acid" @default.
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• W2079887912 doi "https://doi.org/10.1016/j.saa.2012.05.068" @default.
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