Coordination compounds of la [III] with 7-phenylazo-8-hydroxyquinoline-5-sulphonic acid and some of its derivatives

ABSTRACT

7 Arylazo-8- hydroxquinoline-5-sulphonic acid derivatives were prepared and their ionization constants were determined. The stability constants of La [III] complexes with these dyes have been determined potentiometrically. Conductometric measurements were done to investigate the stoichiometric ratios of the complexes. The solid complexes were prepared and their structure was investigated applying elemental -IR, and Thermogravimetric analysis: