Using amino-functionalized MCM-41, we have successfully encapsulated small anionic molecules, anionic dyes, and anionic metal complexes in the pores of MCM-41. The anions are incorporated through ion-exchange via protonated amine groups on the pore surface. By changing the pH, the anions can either be absorbed or released by the MCM-41. Anions encapsulated include ibuprofen, congo red, and [Fe(ox)<sub>3</sub>]<sup>-3</sup>. The encapsulation, capture, and release have been characterized by PXRD, FTIR, Visible Reflectance spectroscopy, and UV-Vis spectroscopy.

Encapsulation of anionic species using amino-functionalized MCM-41

ACS Spring 2022

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