The acetonitrile complex [Mn(NCCH3)6] [B(C6F5)4]2 has been immobilized in the ordered mesoporous silica MCM-41 functionalized with a pyrazolylpyridine (PP) ligand. A metal loading of 0.72 wt.% (0.13 mmol g−1) was achieved. Powder X-ray diffraction and N2 adsorption–desorption analysis of the derivatized material confirmed that the textural properties of the hexagonally ordered host were preserved during the grafting experiment and that the channels remained accessible, despite reductions in surface area and pore volume. The derivatized material was also characterized by thermogravimetric analysis and vibrational spectroscopy.