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Calorimetric study of the ionization process for 2,5-dinitrophenol in water—dimethylsulfoxide mixtures at 25°C |
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| Authors: | F Rodante G Ceccaroni F Fantauzzi |
| Institution: | Istituto di Chimica, Facoltà di Ingegneria Università di Roma, Rome Italy Istituto di Chimica Applicata ed Industriale Facoltà di Ingegneria, Università dell'Aquila, l'Aquila Italy Libero Istituto Universitariodi Medicina e Chirurgia, l'Aquila Italy |
| Abstract: | The ionization and solution enthalpies of 2,5-dinitrophenol were measured calorimetrically at 25°C in water—DMSO mixtures ranging from 0.1 to 0.8 mole fraction of DMSO. The effect of the nitro group in the ortho position seems to prevail over that of the nitro group in the meta position. The greater acidity of dinitrophenol with respect to the mononitro isomers is explained on the basis of the interference of the nitro group in the metaposition on the interactions between the nitro group in the ortho position and the hydroxyl group or phenolate oxygen. |
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