The immobilization of iron(III) aminopyridine complex on MCM-41: its preparation and characterization

Abstract

Aminopyridinyl iron(III) complex was grafted on chlorosilane modified mesoporous MCM-41 to give MCM-Py-Fe(III). The immobilization was confirmed by FT-IR, 13 C, 29 Si, 15 N CP/MAS NMR, nitrogen adsorption- desorption study and elemental analysis. The powder XRD and TEM microscopy studies of the hybrid material con- firmed the retention of the well-ordered honeycomb hexag- onal structure in MCM-Py-Fe(III). The specific surface area of MCM-Py-Fe(III) was found to be 455 m 2 g -1 and it had a pore volume of 0.27 cm 3 g -1 with an average pore diameter of 26.7 A ˚ . The 13 C CP/MAS NMR of MCM-Py-Fe(III) showed chemical shifts in the range of 113-155 ppm, which was assigned to the aromatic carbons in the pyridine ring. The 15 N CP/MAS NMR showed the presence of chemical shifts at 550, 426 and 401 ppm for the three nitrogen atoms in the catalyst.