Reactions of o,o′-Dihydroxy Azo Dyes with the Third Group M(III) Ions: A Spectroscopic and Electrochemical Study

Figure 2

(a) Absorption spectra of 4⋅10⁻⁵ M Calc (1) with 4⋅10⁻⁵ M of Al(III) (2), Ga(III) (3), In(III) (4), Sc(III) (5), and Y(III) (6); pH 4.9. (b) Absorption spectra of 4⋅10⁻⁵ M KLC (1) with 4⋅10⁻⁵ M of Sc(III) (2) and Y(III) (3); pH 9.5.

(a)

(b)