The grafted amino ligand was covalently bonded to the internal pore surface of HISiO2 through a silanation procedure.
Immobilized transition-metal-aquo complexes such as Mn-II-aquo (I), Cu-II-aquo (II), Co-II-aquo (III), and Zn-II-aquo (IV) were coordinated to the supported wall without impregnation on the surface.