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Cation-selective color changes can be accomplished in dyes in which a heteroatom of the chromophore participates as a donor center in complex formation by a crown ether. The greatest effect (Δλ ≈ 120nm) is observed with the combination (1), M⊕ = Ba2⊕ (2I− as counterion).
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Dix et al. (1978) studied this question.
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