Journal article

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Probing intermetallic coupling in dinuclear N-heterocyclic carbene ruthenium(II) complexes

  • Mercs, Laszlo Department of Chemistry, University of Fribourg, Switzerland
  • Neels, Antonia XRD Application Lab, Centre Suisse d' Electronique et de Microtechnique (CSEM), Neuchatel, Switzerland
  • Stoeckli-Evans, Helen XRD Application Lab, Centre Suisse d' Electronique et de Microtechnique (CSEM), Neuchatel, Switzerland
  • Albrecht, Martin Department of Chemistry, University of Fribourg, Switzerland - School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland
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    11.08.2011
Published in:
  • Inorganic Chemistry. - 2011, vol. 50, no. 17, p. 8188–8196
English A series of bimetallic N-heterocyclic carbene (NHC) ruthenium(II) complexes were synthesized, which comprise two [RuCl₂(cymene)(NHC)] units that are interlinked via the NHC nitrogens by alkyl chains of different length. Electrochemical characterization revealed two mutually dependent oxidation processes for the complex with a methylene linker, indicating moderate intramolecular electronic coupling of the two metal centers (class II system). The degree of coupling decreases rapidly upon increasing the number of CH₂ units in the linker and provides essentially decoupled class I species when propylene or butylene linkers are used. Electrochemical analyses combined with structural investigations suggest a through-bond electronic coupling. Replacement of the alkyl linker with a p-phenylene group afforded cyclometalated complexes, which were considerably less stable. The electronic coupling in the methylene-linked complex and the relatively robust NHC–ruthenium bond may provide access to species that are switchable on the molecular scale.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/302048
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