Synthesis, Photochromic Properties, and Light-Controlled Metal Complexation of a Naphthopyran Derivative.

[摘要]：A light-controlled reversible binding switch based on photochromic 3H-naphtho[2,1-b]pyran is under development for studying cellular oscillatory calcium signals. The binding affinities of the closed and open forms of substituted naphthopyran I for Ca2+, Mg2+, and Sr2+ in buffer were detd. The photochem. ring-opened form of the receptor exhibited increased affinity compared to the thermally stable closed form of the receptor. The binding affinity difference for Ca2+ was ~77-fold at pH 7.6.

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