Spectrophotometric Study of Basicity of Some Substituted α-(Benzamtoomethyl)phenylhydrazines |
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| Authors: | V M Vasi? D D Golobo?anin N Peri?i?-Janji? M Lazarevi? Lj Klisareva |
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| Institution: | 1. Institute of Nuclear Sciences “Vin?a”, Department of Chemistry , P.O. Box 522, 11001, Belgrade, Yugoslavia;2. Institute of Chemistry, Faculty of Sciences, Trg Dositeja Obradovi?a 3 , 21000, Novi Sad, Yugoslavia;3. Faculty of Technology and Metallurgy, The Kiril and Melody University , R. Bo?kovi? 16, 91000, Skopje, Macedonia |
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| Abstract: | The protonation behavior at 25°C in water and in aqueous sulfuric acid solutions of some substituted α-(p-R-benzamidomethyl)phenyl hydrazines (R=H, CH3, Cl, Br) was investigated by UV spectrophotometry. The absorption spectra in sulfuric acid solutions were analyzed by the method of multivariate analysis. The premonition constants of hydrazine (pK1) and amide (pK2) moieties were determined; pK2 values were calculated from the reconstituted absorption spectra by Cox - Yates method. Dependence of pK2 on Hammett's a constants was discussed. |
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| Keywords: | α-(benzamidomethyl)phenylhydrazine UV spectrophotometry protonation constants |
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