Answer to Question #176295 in Inorganic Chemistry for Tota

Question #176295

The isoelectronic [Pd(CO)4] 2+ complex mentioned in the last column of the paper has a significantly


higher CO IR stretching frequency (2248 cm−1 ) compared to [Rh(CO)4]+(2138 cm−1). Is this expected or not? Discuss and compare the two complexes.


1
Expert's answer
2021-03-30T07:50:40-0400

It is expected ;

Conjugation with a double bond or benzene ring lowers the stretching frequency.The stretching frequency of the conjugated double bond is also lowered (blue notation) and may be enhanced in intensity.


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