CCL: About phosphorus-carbon double bond vibrational-frequency(ies)

[zborowsk <zborowsk..chemia.uj.edu.pl>]

 Sent to CCL by: zborowsk [zborowsk:+:chemia.uj.edu.pl]
 Daniel,
>   If
>  you're lucky, there won't be too many vibrational nodes with
>  frequencies in your range, and you can pick out the C=P stretch from
>  watching the animation.
it looks you are  not lucky, because you said you cannot find the C+P
 stretching band by vibrational modes animation.
>  If you are unlucky, there will be several other vibrational nodes
> with similar frequencies, and every one of those modes will be a
>  mixed
>  mode that has only some C=P stretching character.
This is probably your case. The C=P stretching is probably coupled
 with
 other internal coordinates and should be detected in several modes. You
 have to perform the Potential Energy Distribution analysis in order to
 detect in which vibrational bands the C=P is involved.
 regards