A Robust Mn Catalyst for H2O2 Disproportionation in Aqueous Solution. Issue 22 (31st May 2013)

• Record Type: Journal Article
• Authors: Lee, Wei‐Tsung; Xu, Song; Dickie, Diane A.; Smith, Jeremy M.
• Other Names: Lu Connie C. sponsoringEditor.; Meyer Karsten sponsoringEditor.
• Is Part Of: European journal of inorganic chemistry. Issue 22/23(2013)
• Page Start: 3867
• Page End: 3873
• Publication Date: 2013-05-31
• Subjects: Manganese -- Reaction mechanisms -- Peroxides -- Homogeneous catalysis -- Macrocycles; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201300184
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract: The pyridinophane complex [Mn(Py2 N2 )(H2 O)2 ] 2+ catalyses the disproportionation of H2 O2 in aqueous solution over a wide pH range. Kinetic investigations reveal an induction period, which is proposed to involve the formation of a hydroperoxo intermediate, as well as evidence for catalyst self‐inhibition. A catalytic cycle involving mononuclear intermediates has been proposed. Spectroscopic investigations under turnover conditions are consistent with this proposal and show that the resting state of the catalyst is a mononuclear Mn II complex. The robustness of the catalyst is evidenced by its ability to achieve turnover numbers of 58000 in aqueous solution. Abstract : The macrocycle complex [(Py2 N2 )Mn(H2 O)2 ] 2+ catalyses H2 O2 disproportionation in aqueous solution, achieving large turnover numbers and operating over a wide pH range. Mechanistic studies implicate a monomeric catalyst for H2 O2 disproportionation.