Mixed metal clusters containing carbyne or ketenylidene bridges: High field NMR spectroscopy as a probe for structure and mechanism

High field NMR spectroscopy is shown to be exceedingly valuable as an aid to the determination of the structures of mixed metal clusters and also as a probe for molecular rearrangements. In particular, the incorporation of an isopropyl group into chiral organometallic clusters of the tetrahedral (M2C2) and square-pyramidal (M3C2) types allows the detection of “hidden processes” such as intramolecular racemization or ligand migrations. It is …