The C-O stretching frequencies in the IR spectra of certain meta

Question

The C-O stretching frequencies in the IR spectra of certain metal carbonyl species are as follows:
$Ni(CO)_4 \quad 2056 \text{ cm}^{-1}$
$[Fe(CO)_6]^{2+} \quad 2200 \text{ cm}^{-1}$

The value for CO(g) is $2143 \text{ cm}^{-1}$ . Discuss

10 Jan 2026

Answer :

Word Count : 277

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 _____ _____ ________ ____ ____ _____.
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