Proton transfer caused by excitation of a photoacid attached to the surface of a mesoporous silica nanoparticle activates a nanovalve and causes release of trapped molecules. The protonation of an aniline-based stalk releases a noncovalently bound cyclodextrin molecule that blocked a pore. The results show that pH-responsive molecular delivery systems can be externally controlled using light.
T. M. Guardado-Alvarez, M. M. Russell and J. I. Zink, Chem. Commun., 2014, 50, 8388 DOI: 10.1039/C4CC03293D
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