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Absorbance changes at 539 nm for spiropyran (1.0 × 10−5 mol/L, 298 K, MeCN/H2O = 6:4, V/V) with irradiation for 10 min at 365 nm light (blank sample), and in the presence of different metal ions (1 eq). Note: εi0 was the absorption intensity at 539 nm with different ions without irradiation; εi was the absorption intensity at 539 nm with different ions with irradiation for 10 min at 365 nm.
