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Probing Intermetallic Coupling in Dinuclear N-Heterocyclic Carbene Ruthenium(II) Complexes
Date Issued
2011-08-11
Date Available
2015-08-20T16:02:58Z
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.
Other Sponsorship
Swiss National Science Foundation
Type of Material
Journal Article
Publisher
American Chemical Society
Journal
Inorganic Chemistry
Volume
50
Issue
17
Start Page
8188
End Page
8196
Copyright (Published Version)
2011 American Chemical Society
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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