Title: Spectroscopic Determination of Acidity Constants of Some Monoazo Resorcinol Derivatives
Abstract: The acidity constants, as pKa values, of six monoazo resorcinol derivatives were determined by the UV–visible spectroscopic technique at 25 °C (± 0.1 °C). The protonation and deprotonation behaviors of the studied molecules were studied from the super basic to the super acid region (i.e., 10 N NaOH to 98 % H2SO4) including the pH region. It was observed that deprotonation occurs at the resorcinol ring. The first protonation occurs at the nitrogen atom next to the resorcinol ring, whereas the second protonation occurs at the nitrogen atom next to the phenyl ring.
Publication Year: 2008
Publication Date: 2008-04-12
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 9
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