Efficient Photochemical Switching of Metal-Ion Complexation by Malachite Green Leuconitrile Derivatives Carrying Bis(crown ether)
摘要:
A Malachite Green derivative incorporating a bis(monoazacrown ether) structure enables efficient photocontrol of metal ion complexation. Its photochromism in the presence of alkali metal ions is examined by kinetics measurements and molecular-orbital (MO) calculation.
Three types of triphenylmethane leuconitrile derivatives incorporating one, two, and three monoaza-15-crown-5 moieties have been designed to attain photocontrol of metal-ion complexation primarily by intramolecular electrostatic repulsion. Photochromism of the crowned triphenylmethane leuconitriles is influenced by the cation complexation of their crown ether moiety to a considerable extent. Molecular