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
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 27979
- DOI 10.1021/ic200651h
- Persistent URL
- https://folia.unifr.ch/unifr/documents/302048
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