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Cu2+ causes ~100 nm red−shift in λmax of 1 at pH 8.0. (A) UV−vis spectral changes of 1 upon titration with Cu2+. [1] = 0.02 mgmt. (B) The absorbance changes at 430 nm (○) and 526 nm (●) saturated at [Cu2+]/[1] = 1. (C) The comparison of the final spectrum of 1 titrated with Cu2+ (–––) and 1 mixed with an equal amount of dichloro(1, 10−phenanthroline)Cu(II) (----).
