Figure 4.

Relative fluorescence intensity diagram of [H₃L1-Al³⁺] system in the presence of different cations in 10 mM HEPES buffer at pH 7.4. 1 = only H₃L1 and (2–15) = H₃L1 (10 μM) + Al³⁺ (10 μM) + Mⁿ⁺ (40 μM), where Mⁿ⁺ = (2—Ca²⁺, 3—Co²⁺, 4—Hg²⁺, 5—Zn²⁺, 6—Cr³⁺, 7—Mg²⁺, 8—Mn²⁺, 9—Na⁺, 10—Ni²⁺, 11—K⁺, 12—Pb²⁺, 13—Cu²⁺, 14—Fe³⁺, 15—Cd²⁺).