Synthesis of Siliceous MCM-41 grafted with transition metal carbonyls

摘要

Grafted transition metal carbonyls over siliceous MCM-41 have been synthesized and further characterized by IR spectroscopy, showing bands in the range between 1800 cm~(-1) and 2100 cm~(-1), which are characteristic of metal carbonyls. ~(29)Si MAS NMR spectra indicate that the interaction of the metal complexes with the silica wall of MCM-41 provokes a modification of the relaxation time of the silanol surface groups. The XRD study confirmed the stability of the hexagonal structure of the parent MCM-41 after the grafting procedure. The Thermo-analytical characterization of the silica-grafted complexes indicates the complete removal of the carbonyl bonds in a single endothermic step, leaving an oxide residue.