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pH对偶氮苯染料铬蓝黑由偶氮苯到腙互变异构的影响
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摘要
偶氮苯染料广泛应用于纺织,造纸,食品,化妆品和制药行业。1偶氮苯分子具有光响应性并且其吸收光谱具有pH可调控性,因此研究不同pH条件下偶氮苯的光谱性质至关重要。2我们通过测定其水溶液的紫外可见吸收光谱发现铬蓝黑在碱性条件下最大吸收峰较酸性条件下的更为红移,我们运用密度泛函理论(DFT)计算了偶氮苯在不同pH值范围内的不同质子化程度构型的电子结构,在不同pH条件下,不仅存在质子化程度的差异还存在分子内的质子迁移即偶氮与腙的互变异构,而且偶氮与腙的反应能垒比较低。酸性条件下,分子主要以偶氮形式存在;碱性条件下,分子主要以腙的形式存在且会发生进一步的反应。探索酸碱性对偶氮苯互变异构的影响对染料降解和其在光电材料中的应用提供更多的深刻的理解。
Azo dyes are widely used in the textile, paper, food, cosmetic, and pharmaceutical industries. The effect of the acidity or alkalinity on the absorption spectra of calcon aqueous solutions was investigated using UV/Vis experiments. The maximum absorption peaks in alkalinity conditions are more red shifted than in acidity conditions. The electronic structure of calcon at different pH has been calculated by density functional theory(DFT). In acidity conditions, the azo form is the main species. While the hydrazone form is the main species in alkalinity conditions. Exploring the effect of pH on Azo-hydrazone tautomerism give more insight into degradation of azo dye and the application in organic photoelectric material.
引文
[1]Ozen,A.S.;Doruker,P.;Aviyente,V.J.Phys.Chem.A.2007,111:13506
    [2]Abbott,L.C.;Batchelor,S.N.;Oakes,J.;Gilbert,B.C.;Whitwood,A.C.J.Phys.Chem.A.2005,109:2894

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