Determination of uranium(VI) and thorium(IV) complexes of 5-chloro-7-amino-8-hydroxyquinoline
Makaleler > Tam Makale · 1995
Yazarlar: Perihan ÜNAK, T OZKAYALAR, D OZDEMIR, Fatma YURT
Journal of Radioanalytical and Nuclear Chemistry Articles, SCI Expanded İndekslerine Giren Dergi, Uluslararası, 1995, cilt 196, ss 323-330
DOI: 10.1007/bf02038051
Özet
5-Chloro-7-amino-8-hydroxyquinoline which is a 8-hydroxyquinoline derivative was synthesized and its thorium(IV) and uranium(Vr) complexes have been determined. 5-Chloro-7-nitro-8-hydroxyquinoline was prepared by nitration reaction of 5-chloro-8-hydroxyquinoline in aqueous solution of nitric acid. Then 5-chloro-7-amino-8-hydroxyquinoline was synthesized by reduction with sodium dithionite. Proton-ligand stability constants of 5-chloro-7-amino-8-hydroxyquinoline and stability constants of thorium(IV) and uranium(VI) complexes forming this ligand were determined by using the Irving-Rossotti method computing the Calvin-Bjerrum pH-titration data. As a result, thorium(IV) complexes were found more stable than uranium(VI) complexes.