Mercs, Laszlo Neels, Antonia Albrecht, Martin 2008-09-22 Bimetallic homonuclear iron(II) and ruthenium(II) <i>N</i>-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. application/pdf https://folia.unifr.ch/global/documents/301051 https://folia.unifr.ch/documents/301051/files/albrecht_ppn.pdf https://folia.unifr.ch/documents/301051/files/albrecht_ppn_sm.pdf https://folia.unifr.ch/documents/301051/files/albrecht_ppn_sm.txt eng info:eu-repo/semantics/altIdentifier/doi/10.1039/b809721f info:eu-repo/semantics/openAccess License undefined Dalton Transactions. - 2008, vol. 41, p. 5570-5576 info:eu-repo/classification/udc/54 Probing the potential of N-heterocyclic carbenes in molecular electronics: redox-active metal centers interlinked by a rigid ditopic carbene ligand http://purl.org/coar/resource_type/c_6501