Two tetranuclear Mn-complexes as biomimetic models of the oxygen evolving complex in Photosystem II - A synthesis, characterisation and reactivity study
2009 (English)In: Dalton Transactions, ISSN 1477-9226, E-ISSN 1477-9234, Vol. 45, 10044-10054 p.Article in journal (Refereed) Published
In this work we report the preparation of two metallamacrocyclic tetranuclear manganese(II) complexes, [L1(4)Mn(4)](ClO4)(4) and [L2(4)Mn(4)](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 [L1(4)Mn(4)](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.
Place, publisher, year, edition, pages
2009. Vol. 45, 10044-10054 p.
DINUCLEAR MANGANESE COMPLEX; WATER-OXIDATION; FUNCTIONAL-MODEL; EVOLUTION; SPECTROSCOPY, LIGANDS, CHEMISTRY, MECHANISM, EXCHANGE, CLUSTER
Research subject Materials Chemistry
IdentifiersURN: urn:nbn:se:su:diva-34864DOI: 10.1039/b906175dISI: 000271714800014OAI: oai:DiVA.org:su-34864DiVA: diva2:286726
övriga författare 3st.2010-01-152010-01-132011-06-20Bibliographically approved