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T. Brietzke, T. Dietz, A. Kelling, U. Schilde, J. Bois, H. Kelm, M. Reh, M. Schmitz, T. Körzdörfer, S. Leimkühler, U. Wollenberger, H.-J. Krüger, H.-J. Holdt
The 1,6,7,12-Tetraazaperylene Bridging Ligand as an Electron Reservoir and Its Disulfonato Derivative as Redox Mediator in an Enzyme-Electrode Process
Chemistry - A European Journal 2017, 23, 15583
DOI: 10.1002/chem.201704226
The homodinuclear ruthenium(II) complex [{Ru(l-N₄Me₂)}₂(μ-tape)](PF₆)₄ {[1](PF₆)₄}(l-N₄Me₂=N,N′-dimethyl-2,11-diaza[3.3](2,6)-pyridinophane, tape=1,6,7,12-tetraazaperylene) can store one or two electrons in the energetically low-lying π* orbital of the bridging ligand tape. The corresponding singly and doubly reduced complexes [{Ru(l-N₄Me₂)}₂(μ-tape.−)](PF₆)₃ {[2](PF₆)₃} and [{Ru(l-N₄Me₂)}₂(μ-tape2−)](PF6)₂ {[3](PF₆)₂}, respectively, were electrochemically generated, successfully isolated and fully characterized by single-crystal X-ray crystallography, spectroscopic methods and magnetic susceptibility measurements. The singly reduced complex [2](PF₆)₃ contains the π-radical tape.− and the doubly reduced [3](PF₆)₂ the diamagnetic dianion tape2− as bridging ligand, respectively. Nucleophilic aromatic substitution at the bridging tape in [1]4+ by two sulfite units gave the complex [{Ru(l-N₄Me₂)}₂{μ-tape-(SO3)₂}]2+ ([4]2+). Complex dication [4]2+ was exploited as a redox mediator between an anaerobic homogenous reaction solution of an enzyme system (sulfite/sulfite oxidase) and the electrode via participation of the low-energy π*-orbital of the disulfonato-substituted bridging ligand tape–(SO₃3)₂2− (Ered1=−0.1 V versus Ag/AgCl/1 m KCl in water).
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Greeting from the managing director Prof. Dr. H. Schlaad

Welcome to the WEB-SITE of Chemistry at the University of Potsdam. We invite you to get acquainted with our research and teaching expertise, the outstanding equipment of our laboratories and already existing national and international collaborations. You find us in Wissenschaftspark Golm. If you would like to study Chemistry at the University of Potsdam or if you want to benefit from our research activities and collaborate with us, you are cordially welcome.
Prof. Dr. Helmut Schlaad

Research Groups

Analytical Chemistry

Prof. Heiko Möller - Analytical Chemistry

Inorganic Chemistry

Prof. Hans-Jürgen Holdt - Inorganic Chemistry

N.N. - Inorganic Materials Chemistry

Prof. Andreas Taubert - Supramolecular Chemistry

Didactics of Chemistry

apl. Prof. Brigitte Duvinage

Organic Chemistry

Prof. Torsten Linker - Organic Chemistry

Prof. Bernd Schmidt - Organic Syntheses

Prof. Pablo Wessig - Bioorganic Chemistry

Physical and Theoretical Chemistry

Prof. Hans-Gerd Löhmannsröben - Physical Chemistry

Prof. Peter Saalfrank - Theoretical Chemistry

JProf. Henrike Müller-Werkmeister - Physical Chemistry

JProf. Thomas Körzdörfer - Theoretical Chemistry

JProf. Ilko Bald - Physical Chemistry

Colloidal and Polymer Chemistry

Prof. Joachim Koetz - Colloidal Chemistry

Prof. Helmut Schlaad - Polymer Chemistry

Joint Professors

Prof. Alexander Böker - IAP

Prof. André Laschewsky - IAP

Prof. Andreas Lendlein - HZG

Prof. Yan Lu - HZB

Further research groups

Dr. Claudia Pacholski

apl. Prof. Dr. Michael U. Kumke

apl. Prof. Dr. Uwe Schilde

Honorary Professors

Prof. Dr. Markus Antonietti (MPIKG)

Prof. Dr. Ulrich Buller (FHG)

Prof. Dr. Peter H. Seeberger - (MPIKG)

Retired Professors