Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 4, Pages 879-887Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200300157
Keywords
manganese; tripodal ligands; bioinorganic chemistry; enzyme models
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A series of five new dinuclear manganese (II/II) compounds with derivatives of 2-{[bis(pyridin-2-ylmethyl)amino]methyl}phenol (HL1) were synthesized and structurally characterized. All complexes crystallize in monoclinic space groups and exhibit (MnMn)-Mn-... separations in the range of 3.392(8)-3.493(2) Angstrom caused by bis(mu-phenoxo) bridging modes. The derivatives of HL1 contain either electron-donating or -withdrawing substituents. A correlation between the electronic character of the different ring substituents, the redox potentials of the dinuclear transition metal complexes and the catalase activity has been revealed. In analogy to manganese catalase, all complexes show saturation kinetics at high substrate concentration. The investigated catalase activity places the compounds in the upper range of functional catalase mimics. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.
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