The vibrational frequency of CO when bound to a metal ion is lower than that of free CO because
A) the crystal field shifts the energy of the vibration.
B) CO is a weak field ligand.
C) the high electronegativity of the metal ion.
D) the metal donates an electron to a bonding orbital of CO.
E) the metal donates an electron to an antibonding orbital of CO.
Correct Answer:
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