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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

  • Mercs, Laszlo Department of Chemistry, University of Fribourg, Switzerland
  • Neels, Antonia Institute of Microtechology, University of Neuchâtel, Switzerland
  • Albrecht, Martin Department of Chemistry, University of Fribourg, Switzerland
Published in:
  • Dalton Transactions. - 2008, vol. 41, p. 5570-5576
English 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.
Faculté des sciences et de médecine
Département de Chimie
  • English
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