Analytical applications of the reactions of 2-and 10-disubstituted phenothiazines with some metal ions

Phenothiazines substituted in the 2 acid 10 positions are a large and impor tant family of tricyclic aromatic compounds. Due to their characteristic st ructure they exhibit many valuable analytical properties. They form coloure d oxidation products with many oxidizing agents and the complexes with plat inum metals. They also react with thiocyanate and halide complexes of metal s as well as some organic substances, and form ion-association compounds. T he reactions mentioned above are the basis for utilizing the phenothiazines as reagents and indicators in chemical analysis. The analytical applicatio ns of phenothiazines with some metals are described in the presented paper in details. The paper presents the analytical properties of 2,10- disubstit uted phenothiazines, describes the reaction of phenothiazines with the oxid izing agents and the complexing abilities of phenothiazines. The paper is b ased on a review of the chemical literature up to 1995.