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Issue 45, 2009
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Two tetranuclear Mn-complexes as biomimetic models of the oxygen evolving complex in Photosystem II. A synthesis, characterisation and reactivity study

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Abstract

In this work we report the preparation of two metallamacrocyclic tetranuclear manganese(II) complexes, [L14Mn4](ClO4)4 and [L24Mn4](ClO4)4 where L1 and L2 are the anions of the heptadentate ligands 2-((2-(bis(pyridin-2-ylmethyl)amino)ethyl)(methyl)amino)acetic acid and 2-(benzyl(2-(bis(pyridin-2-ylmethyl)amino)ethyl)amino)acetic acid), respectively. The complexes have been fully characterized by ESI-MS, elemental analysis, single-crystal X-ray diffraction, magnetic susceptibility, and EPR spectroscopy. Electrochemical reactions as well as reactions with different chemical redox reagents have been performed and a reversible two electron oxidation per manganese ion has been identified. The reaction of [L14Mn4](ClO4)4 with oxone or cerium(IV) results in the evolution of oxygen which makes this system interesting for future studies in the search for a functional mimic of the oxygen evolving complex in Photosystem II.

Graphical abstract: Two tetranuclear Mn-complexes as biomimetic models of the oxygen evolving complex in Photosystem II. A synthesis, characterisation and reactivity study

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Publication details

The article was received on 27 Mar 2009, accepted on 05 Jun 2009 and first published on 29 Jun 2009


Article type: Paper
DOI: 10.1039/B906175D
Citation: Dalton Trans., 2009,0, 10044-10054
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    Two tetranuclear Mn-complexes as biomimetic models of the oxygen evolving complex in Photosystem II. A synthesis, characterisation and reactivity study

    G. Berggren, A. Thapper, P. Huang, P. Kurz, L. Eriksson, S. Styring and M. F. Anderlund, Dalton Trans., 2009, 0, 10044
    DOI: 10.1039/B906175D

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