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Inorg Chem. 2015 Jul 06;54(13):6347-55. doi: 10.1021/acs.inorgchem.5b00667. Epub 2015 Jun 12.

Ruthenium Carbon-Rich Complexes as Redox Switchable Metal Coupling Units.

Inorganic chemistry

Emmanuel Di Piazza, Areej Merhi, Lucie Norel, Sylvie Choua, Philippe Turek, Stéphane Rigaut

Affiliations

  1. †UMR 6226 CNRS-Université de Rennes 1, Institut des Sciences Chimiques de Rennes, Campus de Beaulieu, F-35042, Rennes Cedex, France.
  2. ‡UMR 7177 CNRS-Université de Strasbourg, Institut de Chimie, 1 rue Blaise Pascal, BP 296 R8, F-67008 Strasbourg Cedex, France.

PMID: 26068041 DOI: 10.1021/acs.inorgchem.5b00667

Abstract

With the help of EPR spectroscopy, we show that the diamagnetic [Ru(dppe)2(-C≡C-R)2] system sets up a magnetic coupling between two organic radicals R, i.e., two nitronyl nitroxide or two verdazyl units, which is stronger than that of related platinum organometallic systems. Surprisingly, further oxidation of the ruthenium redox-active metal coupling unit (MCU), which introduces an additional spin unit on the carbon-rich part, leads to the switching off of this interaction. On the contrary, in simpler complexes bearing only one of the organic radical ligands [C6H5-C≡C-Ru(dppe)2-C≡C-R], one-electron oxidation of the transition metal unit generates an interaction between the two spin carriers of comparable magnitude to that observed in the above corresponding neutral systems.

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