Discuss the stretching frequency of CO (IR active) for the following molecules:Mo(CO)4(en) ...

Question

Discuss the stretching frequency of CO (IR active) for the following molecules:Mo(CO)4(en)  en-ethylenediamineMo(CO)3(dien) dien- diethylenetriamineMo(CO)4(bipy) bipy-bipyridine

Robert · Accepted Answer

Solution: 
Some general facts regarding stretching frequencies: 
1. By increasing the number of bonds between two atoms, the stiffness of the bond 
increases which will results in a harder bond to stretch. 
2. By increasing the %s character in a bond, the bond becomes stiffer. 
3. Because of the large dipole of carbonyl bonds, it displays strong, relatively sharp peaks.
Stretching frequency of the mostly carbonyl compound are around 1710-1720 cm-1 
(which is higher than alkene). 
4. Electron donation decreases CO stretching frequency. 
5.

Discuss the stretching frequency of CO (IR active) for the following molecules:Mo(CO)4(en) en-ethylenediamineMo(CO)3(dien) dien- diethylenetriamineMo(CO)4(bipy) bipy-bipyridine

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