(a) The IR spectrum of naturally occurring CO shows an absorption at 2170 cm-1 assigned to the molecular vibrational mode. If the sample is enriched in 13C, what change do you expect to see in the IR spectrum?
(b) The IR spectra of salts of [Fe(CO)A]2+ and [Fe(CO)4|2- , respectively show absorptions at 22O4 and 1788 cm1 assigned to carbonyl vibrational modes. What do these tell you about the strengths of the carbon-oxygen bonds in the complexes compared to that in free CO?
(c) [Fe(CO)4]2- and Fe(CO)5 have Td and Z)3h symmetries respectively. What do you expect to observe in the room temperature I3C NMR spectra of Na2[Fe(CO)4| and Fe(CO)s? Rationalize your answer.
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