Question
The C-O stretching frequencies in the IR spectra of certain metal carbonyl species are as follows:
The value for CO(g) is . Discuss
Answer :
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The C–O stretching frequency in IR spectroscopy is a sensitive indicator of the bonding environment in carbonyl compounds, particularly in metal carbonyl complexes. In free CO gas, the C–O stretching frequency is observed at approximately 2143 cm⁻¹, reflecting a strong triple bond between carbon and oxygen. When CO coordinates to a metal center in organometallic complexes, back-donation from the filled metal d-orbitals into the empty π* antibonding orbital of CO occurs. This π-backbonding weakens the C–O bond, lowering its bond order and consequently decreasing the stretching frequency in the
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