Alkane oxidation by dinuclear iron complexes in hexagonal mesoporous solids

✍ Scribed by Peter-Paul Knops-Gerrits; An Verberckmoes; Robert Schoonheydt; Masaru Ichikawa; Peter A. Jacobs

• Book ID: 104431508
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 977 KB
• Volume: 21
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(98)00132-2

✦ Synopsis

Biomimetic oxygen activation on binuclear iron active sites occluded within the voids of mesoporous oxides such as HMS (hexagonal mesoporous silica) is an interesting new field of research. As guests, binuclear iron( III ) complexes were chosen. Heptapodate N,N,N',N'-tetrakis(2-R methyl)-2-hydroxy-1,3-diaminopropane ligands in which R is either a pyridyl or a benzimidazole group allow metal coordination as in methane mono-oxygenase active sites. The physicochemical characterization with SEM. TGA and sorption analysis shows the interactions of the complexes with the support. IR, Raman and diffuse reflectance-UV--Vis--NIR spectroscopy is used to monitor interaction of oxygen ( lhO2 and "0,) or peroxides with the supported active sites. The cyclohexane, cyclohexylhydroperoxide and isobutane oxidation is described and the mono-and binuclear mechanisms that are occurring in nucleophilic and electrophilic activation pathways are discussed.