Epoxidation of olefins catalyzed by novel Mn(III) and Mo(IV) Salen complexes immobilized on mesoporous silica gel: Part I. Synthesis and characterization of homogeneous and immobilized Mn(III) and Mo(IV) Salen complexes

New ways of the covalent immobilization of Mn(III) and Mo(IV) Salen complexes on a mesoporous silica support to produce a stable heterogeneous catalyst for epoxidation reactions are reported. Peptide and ester interactions were employed to anchor the metal Salen complex on the organo-modified silica framework. Electrospray MS, FTIR, TGA, ICP-OES and elemental analysis were used for quantitative and qualitative analyses of the immobilized Salen complexes. The results confirm the location of the metal Salen complex inside the mesopores covalently attached to the silica framework.

Graphical abstractMn(III) and Mo(IV) Salen complexes were immobilized on amorphous mesoporous silica support by new covalent immobilization techniques. (3-Aminopropyl)trimethoxysilane and (3-iodopropyl)trimethoxysilane were used in a post-synthesis grafting method to prepare organo-modified porous materials. Peptide and ester interactions were employed to anchor the Salen complex to the silica framework. Figure optionsDownload full-size imageDownload as PowerPoint slide