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Organometallic Chemistry: Ligands in the NMR Spectrum

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How many signals from the CO ligands do you expect to see in the 13C NMR spectrum of each of these complexes? Explain.
a) [V(CO)6]
b) cis-[Rh(Br)(CO)2(PPh3)]
c) [Fe2(CO)4(Cp)2]
d) [Mn(CO)5(CH3)]

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a) One signal since all CO molecules are equivalent.
b) Two signals since the two CO ...

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