Figure 11.

Absorption spectral changes of 2 with Fe³⁺ in SDS (0.02 M, pH 6)–acetonitrile 99:1 (v/v) solution (2 × 10⁻⁵ M): (a) UV-Vis titration of 2 upon gradual addition of Fe³⁺; (b) absorbance at 462 and 515 nm as a function of added Fe³⁺ equiv.; (c) Job’s plot for the complexation of 2 with Fe³⁺ at 515 nm.