ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Acid-base equilibriums of some azo compounds in dimethyl sulfoxide. I. Study of some dialkylaminophenylazo derivatives of 1,1-dimethyl-3,5-cyclohexadiones in DMSO and their use in titrations in DMSO

E. Kozáková, V. Madajová, P. Majer, and Z. Smetanová

Fac. Nat. Sci., Komsensky-Univ., Bratislava

Abstract: Acid-base properties in dimethyl sulfoxide (DMSO) of two 1,1-dimethylamino-3,5-cyclohexadione dialkylaminophenylazo derivatives, namely 2-(p-N-diethylaminophenylazo)-l5l-dimethyl-3,5-cyclohexadione (I) and 2-(p-N-ethyl-N-hydroxyethylaminophenylazo)-1, l-dimethyl-3,5-cyclohexadione (//), have been studied. Dissociation constants of / and II in DMSO have been determined spectrophotometrically. Compound I can be used as an acid-base indicator in the analysis of a mixture of a strong and weak acid in DMSO. Compound II is a suitable acid-base indicator for the determination of very weak acids in DMSO.

Full paper in Portable Document Format: 295a590.pdf (in German)

Chemical Papers 29 (5) 590–598 (1975)