High Turnover Catalase Activity of a Mixed‐Valence MnIIMnIII Complex with Terminal Carboxylate Donors

E-ISSN： 1099-0682|2015|21|3485-3492

ISSN： 1434-1948

Source： EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (ELECTRONIC), Vol.2015, Iss.21, 2015-07, pp. : 3485-3492

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Abstract

AbstractThe neutral dimanganese(II,III) complex [Mn2(BCPMP)(OAc)2] [1; BCPMP3– = 2,6‐bis({(carboxymethyl)[(1‐pyridyl)methyl]amino}methyl)‐4‐methylphenolato] has been synthesized and characterized. The complex contains two terminal carboxylate donors. Complex 1 was found to be an effective catalyst for the disproportionation of H2O2 with high catalytic rate and a turnover number of 7500, the highest turnover reported to date for a catalase mimic. The rates and TON were significantly higher than recorded for a dicationic dimanganese(II,III) counterpart ([Mn2(BPBP)(OAc)2]·(ClO4)2, 2; BPBP– = 2,6‐bis{[bis(2‐pyridylmethyl)amino]methyl}‐4‐butylphenolato), which lacks the terminal carboxylate donors, suggesting that introduction of a terminal carboxylate donor improves activity. A well‐resolved 16‐line pattern obtained upon addition of H2O2 to complex 1 suggests involvement of an MnIIIMnIV species in the catalytic cycle.