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Fluxional organometallic compounds are organometallic compounds in which the ligands or atoms undergo rapid and continuous rearrangement within the molecule, so that different nuclei exchange their positions on the NMR time scale. Such molecules are therefore described as fluxional or dynamically mobile compounds. Although a molecule may possess several chemically non-equivalent positions at any particular instant, rapid intramolecular rearrangement can make these positions equivalent when observed by NMR spectroscopy. A classic example is iron pentacarbonyl, Fe(CO)₅. Its structure is approximately trigonal bipyramidal, containing two axial and three equatorial carbonyl groups. ___ ____ __________ _____ ______ __________ ________ __________ ________ _________.
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