π-Stacking attraction vs. electrostatic repulsion: competing supramolecular interactions in a tpphz-bridged Ru(II)/Au(III) complex.

Sorsche D, Schaub M, Heinemann FW, Habermehl J, Kuhri S, Guldi DM, Guthmuller J, Rau S (2016)

Publication Status: Published

Publication Type: Journal article

Publication year: 2016

Journal

Dalton Transactions Royal Society of Chemistry

Book Volume: 45

Pages Range: 12846-12853

Journal Issue: 32

DOI: 10.1039/c6dt01643j

Abstract

The synthesis and characterization of a mixed metal ruthenium(ii)/gold(iii) complex bridged by tetrapyridophenazine (tpphz) are described. It is isostructural and isoelectronic to the well-known photocatalysts with palladium(ii) or platinum(ii). Concentration dependent (1)H-NMR spectroscopy and XRD studies show that the electrostatic repulsion between the gold(iii) moieties exceeds the attractive π-stacking interaction. Theoretical calculations based on the new structural data confirm an increased positive charge on the bridging ligand as well as significantly altered orbital symmetry as compared to the previously investigated palladium(ii) complex. This is the first example of a tpphz ruthenium(ii) complex where π-stacking is completely inhibited. The detailed investigation of the solid-state structure showed for the first time in bimetallic tpphz bridged complexes no significant torsion within the bridging ligand itself. Although catalytic performance for proton reduction by gold(iii) is naturally not observed, its photochemical decomposition in colloidal gold particles could be shown by TEM and DLS.

Authors with CRIS profile

Frank Wilhelm Heinemann Lehrstuhl für Anorganische und Allgemeine Chemie Dirk Michael Guldi Lehrstuhl für Physikalische Chemie I

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE) Gdańsk University of Technology (GUT) / Politechnika Gdańska PL Poland (PL) Universität Ulm DE Germany (DE)

How to cite

APA:

Sorsche, D., Schaub, M., Heinemann, F.W., Habermehl, J., Kuhri, S., Guldi, D.M.,... Rau, S. (2016). π-Stacking attraction vs. electrostatic repulsion: competing supramolecular interactions in a tpphz-bridged Ru(II)/Au(III) complex. Dalton Transactions, 45(32), 12846-12853. https://doi.org/10.1039/c6dt01643j

MLA:

Sorsche, Dieter, et al. "π-Stacking attraction vs. electrostatic repulsion: competing supramolecular interactions in a tpphz-bridged Ru(II)/Au(III) complex." Dalton Transactions 45.32 (2016): 12846-12853.

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