From owner-chemistry@ccl.net Mon May  9 11:59:01 2016
From: "zborowsk zborowsk]|[chemia.uj.edu.pl" <owner-chemistry(_)server.ccl.net>
To: CCL
Subject: CCL: About phosphorus-carbon double bond vibrational-frequency(ies)
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X-Original-From: zborowsk <zborowsk..chemia.uj.edu.pl>
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Date: Mon, 09 May 2016 16:58:19 +0200
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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