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Issue 41, 2008
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Probing the potential of N-heterocyclic carbenes in molecular electronics: redox-active metal centers interlinked by a rigid ditopic carbene ligand

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Abstract

Bimetallic homonuclear iron(II) and ruthenium(II)N-heterocyclic carbene complexes have been synthesized and crystallographically analyzed. As a spacer ligand for interconnecting the two redox-active metal centers, a ditopic carbene ligand has been used that comprises two carbene sites annelated to benzene. Detailed electrochemical and spectroelectrochemical analyses of the bimetallic systems revealed that despite the potentially π-delocalized nature of the ditopic ligand, the iron centers are only moderately coupled. In the ruthenium complexes, the intermetallic interactions are very weak and the centers are electrochemically nearly independent. A model is proposed for rationalizing these observations which is based on (i) relatively weak charge delocalization in the spacer ligand and (ii) on electrostatic factors governing the metal–carbene bond.

Graphical abstract: Probing the potential of N-heterocyclic carbenes in molecular electronics: redox-active metal centers interlinked by a rigid ditopic carbene ligand

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Supplementary files

Article information


Submitted
09 Jun 2008
Accepted
30 Jul 2008
First published
22 Sep 2008

Dalton Trans., 2008, 5570-5576
Article type
Paper

Probing the potential of N-heterocyclic carbenes in molecular electronics: redox-active metal centers interlinked by a rigid ditopic carbene ligand

L. Mercs, A. Neels and M. Albrecht, Dalton Trans., 2008, 5570
DOI: 10.1039/B809721F

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