| Autor: |
Milovanović, Ljiljana T., Karljiković-Rajić, Katarina D., Stanković, Branislava S. |
| Zdroj: |
Monatshefte für Chemie / Chemical Monthly; October 1988, Vol. 119 Issue: 10 p1069-1078, 10p |
| Abstrakt: |
The UV absorption spectra of 1-(1-hydroxyimino-2-oxo-2-phenyl) pyridinium chloride (compound I) and 1-(1-hydroxyimino-2-oxo-2-phenyl)-4-hydroxyiminomethyl pyridinium chloride (compound II) in water solution at differentpH values have been measured. The spectral changes, with changingpH, in aqueous solutions are attributed to the dissociation of individual functional groups of the compounds. The mixed acidic constants (pK'a) of the investigated monoxime and dioxime, have been determined spectrophotometrically in the series ofBritton-Robinson's buffer solutions in thepH range 3.0–5.19 and 7.70–9.90 (t=25±0.5°C,I=0.2). The followingpK'a values have been obtained for monoximepK'a1=4.30 and for dioximepK'a1=4.28,pK'a2=8.36. |
| Databáze: |
Supplemental Index |
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