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(A) The UV spectrum of compound 7k (37.5 μM) alone or in the presence of CuCl2, FeSO4, ZnCl2 and AlCl3 (37.5 μM) in methanol; (B) Determination of the stoichiometry of complex-Cu2+ by using molar ratio method at 385 nM. The final concentration of 7k was 37.5 μM, and the final concentration of Cu2+ ranged from 3.75 to 93.75 μM.
