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. 2021 Dec 29;32(2):473–481. doi: 10.1007/s10895-021-02851-9

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© The Author(s) 2021

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Fig. 3 — Series of spectra for fluorescence titration of new ionophore 4 with aqueous solutions of A: Al³⁺, B: Pb²⁺, C: Cd²⁺, D: Zn²⁺ and ethanol solution of E: Pd²⁺ (c_host = 1 μM in acetonitrile)