Samples of Fe(CO)(PF3)4 show two carbonyl stretching bands, at 2038 and 2009 cm-1.
a. How is it possible for this compound to exhibit two carbonyl bands?
b. Fe(CO)5 has carbonyl bands at 2025 and 2000 cm-1. Would you place PF3 above or below CO in the spectrochemical series? Explain briefly. (See H. Mahnke, R. J. Clark, R. Rosanske, R. K. Sheline, J. Chem. Phys. , 1974 , 60 , 2997.)
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