Utilization of immobilized biomimetic iron complexes within nanoreactors of Al-MCM-41 as cyclohexane oxidation catalyst

✍ Scribed by F. Farzaneh; M. Poorkhosravani; M. Ghandi

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 439 KB
• Volume: 308
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2009.03.039

✦ Synopsis

Biomimetic iron(III) complexes such as [Fe(en) 2 Cl 2 ]Cl, [Fe(bpy) 2 Cl 2 ]Cl, [Fe(salen)Cl], [Fe(TPP)Cl] and [Fe(TMC)Cl] in which en, bpy, salen, TMC, and TPP refer to ethylenediamine, 2,2 -bipyridine, N,N -bis(salicylidene)ethylenediamine), 5,7,12,14-tetramethyl-1,4,8,11 tetraazacyclotetradeca 4,6,11,13tetraene and meso-tetraphenylporphyrin were immobilized within nanoreactors of Al-MCM-41. The structures of immobilized complexes were characterized by powder X-ray diffraction (XRD), nitrogen adsorption-desorption, FTIR and UV-vis spectroscopy. The pore volume, surface area and pore diameter of Al-MCM-41 were found to decrease after immobilization of iron complexes. It was found that immobilized iron complexes within Al-MCM-41 with the order of [Fe(bpy) 2 Cl 2 ] > [Fe(TPP)Cl] > [Fe(TMC)Cl] ∼ [Fe(salen)Cl] > [Fe(en) 2 Cl 2 ]Cl catalyze the oxidation of cyclohexane to cyclohexanol and cyclohexanone with hydrogen peroxide in refluxing acetonitrile.