Regulating Copper-Binding Affinity with Photoisomerizable Azobenzene Ligand by Construction of a Self-Assembled Monolayer

摘要

Photoactive molecules have attracted much interest because they allow molecular properties to be changed and switched dramatically. For example, functional molecules and systems that,both bind and release metal ions have been constructed by reversible structural regulation using photo-chromic molecules, such as spiropyran and azobenzene. In the case of a spiropyran derivative, one of the isomers bound a transition-metal ion through its negatively charged group, whereas the other isomer did not. This photoregulated metal-binding system was useful both in solution and in a polymer matrix. However, the metal-binding ability was relatively weak since the binding site was singly negatively charged, and binding sites with two or more charged groups are required for a more effectively regulated metal-binding system.