Fluorescence Titration of Some Purines Determination of Lowest Excited-State Ionization Constants
Makaleler > Tam Makale · 1989
Yazarlar: Mehmet Balcan, Aysel Temizer
Spectroscopy Letters, Uluslararası, 1989, cilt 22, ss 315-321
DOI: 10.1080/00387018908053880
Özet
Excited-state ionization equilibria of 6-methyl purine and xanthine were investigated in a wide range of pH. 6-Methyl purine is known to have two ionization equilibria in its ground-state. It was found that it had one more ionization equilibrium in strongly acidic region. In the excited state, four ionization equilibria were observed. The pK∗ values of three of them were determined by means of fluorescence titration. In the case of xanthine, there exist three ground-state equilibria. In the excited-state, four equilibria were observed. The pK∗ values of two of them were determined by means of fluorescence titration.