Photochromism of 4‘-Methoxyflavylium Perchlorate. A “Write−Lock−Read−Unlock−Erase” Molecular Switching System

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Abstract

In aqueous solution (2 50 °C) and/or pH ≥3, however, AH+ can be quantitatively converted back to Ct (half-life of 15 min at pH 4.0 and 60 °C). Owing to this unique behavior, this represents a novel molecular system in which the color can be controlled by light and changes in temperature and/or pH. The ability to photochemically convert the stable and colorless Ct form to the kinetically inert and colored AH+ form, and the possibility to reconvert AH+ to Ct at high temperature or by a pH jump make the system well-suited as the basis for an optical memory device with multiple storage and nondestructive readout capacity through a write−lock−read−unlock−erase cycle.

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