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The IR spectrum of Fe₂(Cp)₂(CO)₄ provides critical information about the bonding environment, electronic structure, and symmetry of the complex. The most prominent features in the spectrum are the C≡O stretching bands, which typically appear in the region 2000–1850 cm⁻¹ for metal carbonyls. For Fe₂(Cp)₂(CO)₄, multiple CO stretching bands indicate that the CO ligands are in different environments, suggesting the presence of both terminal and possibly bridging _____ _________ ____ ___ _________ _____ ___ ___ __________ _______ __________ __________.
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