Proteolytic Equilibria of Vanillic Acid in the Ground and Excited States
| Autor: | Irina V. Sokolova, N. Yu. Vasil′eva, Olga N. Tchaikovskaya, O. V. Vusovich |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Aqueous solution 010304 chemical physics Carboxylic acid Cationic polymerization Protonation Condensed Matter Physics Photochemistry 01 natural sciences Dissociation (chemistry) chemistry.chemical_compound chemistry Excited state 0103 physical sciences Vanillic acid Phenol Spectroscopy |
| Zdroj: | Journal of Applied Spectroscopy. 83:8-11 |
| ISSN: | 1573-8647 0021-9037 |
| DOI: | 10.1007/s10812-016-0234-0 |
| Popis: | Proteolytic equilibria of vanillic acid in aqueous solutions were studied using electronic spectroscopy. The pH ranges for anionic, dianionic, cationic, and neutral forms of vanillic acid in the ground and excited states were determined. The electron density distribution on atoms in the proteolytic forms was determined using quantum-chemistry methods. The anion formed as a result of dissociation of the carboxylic acid. The dianion formed in the presence of two and more equivalents of alkali as a result of proton loss from the phenol and carboxylic acid. The vanillic acid cation formed via protonation of the carbonyl oxygen. Differences in spectral features of the proteolytic forms in the ground and excited states were observed. |
| Databáze: | OpenAIRE |
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