Abstract
Unsymmetrical aza-macrocycle and its zinc complex, which were designed with the aim of exhibiting the hybrid properties of planar and nonplanar macrocycles, were newly synthesized and showed the attractive property of being color-switching molecules. The colors of the solutions, which contain these compounds with a facile hydrogen atom, can be controlled easily by changing the solvent or the acid and base system. The color of the solution containing the free base macrocycle was orange. Importantly, the color of the solution containing the zinc complex of macrocycle depended on the solvent; the solution of zinc complex, which was formed in dichloromethane, showed colorless, and the solutions of acetonitrile and methanol showed yellow and red, respectively. The color of the solution containing the zinc complex was changed by the addition of acids or bases, and the transformation between the colors of the solutions was reversible. This color-switching phenomenon is considered to be related to the change of t...
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