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 organometallic compounds in which some of the atoms or groups attached to the metal undergo rapid and reversible rearrangements or exchange between equivalent and non-equivalent positions. These molecular changes occur so rapidly that, under ordinary conditions, different structures cannot be isolated separately. The term “fluxional” refers to the continuous and rapid movement of ligands or groups within a molecule. Such behaviour is particularly important in organometallic chemistry because it can be detected and studied effectively by nuclear magnetic resonance (NMR) spectroscopy. A classic example of a fluxional organometallic compound is iron pentacarbonyl, Fe(CO)₅. Its structure is trigonal bipyramidal, containing three equatorial and two axial carbonyl groups. If the molecule were rigid, the axial and equatorial CO groups would occupy chemically different environments. Therefore, in an NMR spectrum, separate signals would be expected for axial and equatorial carbonyl groups. However, Fe(CO)₅ exhibits rapid
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