Probing Intermetallic Coupling in Dinuclear N-Heterocyclic Carbene Ruthenium(II) Complexes

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Title: Probing Intermetallic Coupling in Dinuclear N-Heterocyclic Carbene Ruthenium(II) Complexes
Authors: Mercs, Laszlo
Neels, Antonia
Stoeckli-Evans, Helen
Albrecht, Martin
Permanent link: http://hdl.handle.net/10197/6829
Date: 11-Aug-2011
Abstract: 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.
Type of material: Journal Article
Publisher: American Chemical Society
Copyright (published version): 2011 American Chemical Society
Keywords: Transition-metal-complexes;Chain organometallic polymers;C-h bonds;Molecular wires;Electron-transfer;Catalytic applications;Biscarbene complexes;Building-block;Ligands;Activation
DOI: 10.1021/ic200651h
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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