Photoactivation of Molecular Oxygen by an Iron(III) Porphyrin with a Magnesium Aluminum Layered Double Hydroxide for the Aerobic Epoxidation of Cyclohexene. Issue 8 (9th July 2014)

• Record Type: Journal Article
• Authors: Teramura, Kentaro; Tsuneoka, Hideo; Ogura, Kentaro; Sugimoto, Takashi; Shishido, Tetsuya; Tanaka, Tsunehiro
• Is Part Of: ChemCatChem. Volume 6:Issue 8(2014:Aug.)
• Page Start: 2276
• Page End: 2281
• Publication Date: 2014-07-09
• Subjects: Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201402131
• Languages: English
• ISSNs: 1867-3880

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The photocatalytic aerobic epoxidation of cyclohexene proceeded under visible‐light irradiation only if 5, 10, 15, 20tetrakis(pentafluorophenyl)porphyrin iron(III) chloride ([Fe^III(TPFPP)Cl]) was combined with Mg‐Al layered double hydroxide (Mg‐Al LDH) as a solid base in chloroform. The OH groups in the Mg‐Al LDH exchanged with the axial Cl ligands in [Fe^III(TPFPP)Cl] to afford [Fe^III(TPFPP)OH], which functioned photocatalytically in the presence of Mg‐Al LDH but was inactive in its absence. The band in the action spectrum agreed well with the Soret band in the UV/Vis absorption spectrum of [Fe^III(TPFPP)OH]. The spectral changes indicated the reduction of [Fe^III(TPFPP)OH] to [Fe^II(TPFPP)] under visible‐light irradiation, which in turn activates O₂ that could be used for the epoxidation of cyclohexene.</p> </abstract>