Chemical Forums

Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: Eddzzz_2012 on February 21, 2013, 08:22:40 AM

Title: C-O stretcing frequency.
Post by: Eddzzz_2012 on February 21, 2013, 08:22:40 AM

Hi. I'm trying to determine whether the C-O stretching frequency will increase or decrease in energy if the M-CO bond was weakened. So:

Stronger M-CO pi-backbonding interaction corresponds to strongest backbonder to C-O ligand
Longest C-O bond length corresponds to lowest oxi state because of being a stronger backbonder
C-o Stretching frequency corresponds to longest C-O bond length
Therefore the C-O stretching frequency will if the M-CO bond was weakened.

Is this correct?

Title: Re: C-O stretcing frequency.
Post by: Schrödinger on February 22, 2013, 02:45:25 AM

Quote from: Eddzzz_2012 on February 21, 2013, 08:22:40 AM

Therefore the C-O stretching frequency will if the M-CO bond was weakened.
Is this correct?

Is what correct?

Title: Re: C-O stretcing frequency.
Post by: Enthalpy on February 24, 2013, 02:56:32 PM

What about the stiffness of the M-C bond? We're speaking about mechanical vibrations, and C is lighter than O, so any stiff mass bound to C would decrease the frequency.

This is a question from me, not a suggestion.