Question
With the help of a suitable example explain what fluxional organanometallic compounds are. With the help of NMR studies how their presence was confirmed?
Answer :
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Fluxional organometallic compounds are compounds in which atoms or groups of atoms continuously interchange their positions through rapid intramolecular rearrangements without breaking the overall molecular framework. These dynamic processes occur so rapidly that, at ordinary temperatures, many chemically non-equivalent atoms appear equivalent on the NMR time scale. Fluxionality is commonly observed in transition metal complexes because of their flexible bonding and low-energy rearrangement pathways. A suitable example is iron pentacarbonyl, Fe(CO)₅. It has a trigonal bipyramidal structure with two axial and three equatorial carbonyl ligands. In a rigid structure, the axial and equatorial CO ligands should produce different NMR signals because they occupy different chemical
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