Abstract
Upon the possible capture of a metal ion by the crown ether cavity, the complex formed might be a unique additional π-electron-withdrawing substituent, which, as shown in our previous work [2], activates photochromic properties in spiropyrans containing an azomethine substituent. However, we unexpectedly found that colored merocyanine products are not formed upon photoirradiation of spiropyran 3 at 365 nm. Only reversible E-Z isomerization of the C=N bond (τ30 = 5.1 sec) was observed. The introduction of lithium ions into a solution of spiropyran 3 even in a 30-fold excess did not lead to the appearance of photochromic properties in the system studied in contrast to indoline spiropyrans [3].
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