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A bis-benzospiropyranindoline was prepared by a simple two-step procedure. The magnesium and calcium chelating ability of this photochromic spiropyran was investigated and compared to simple mono-spiropyrans. Kinetic binding constants were measured. Moderately strong metal binding occurs in acetone solution (K=40 000M −1 for Mg, K=13 000M −1 for Ca) when the bis-spiropyran is irradiated...
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