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(a) Emission spectrum changes of SS1 (10 μM) on increasing concentration of Cu2+, Fe2+, and Fe3+ ions in THF/water (7:3, v/v) solution; (b) emission spectrum changes of SS2 (10 μM) on increasing concentration of Cu2+, Fe2+, and Fe3+ ions in THF/water (7:3, v/v) solution.
