P—OH Stretching Vibration

The OH valency vibration is, of course, relatively independent of the nature of the attached group. However, in add compounds of 

and the other P—OH bands have been studied in detail by Thomas et al. [43—45]. They have shown that at very high dilutions the hydrogen bonds can be broken showing that they are indeed intermolecular. Compounds with a P=0 structure show two other 

The OH deformation band is not well defined. Emeleus et al [26,27] assigned it as near 940 cm in some fluorinated compounds, and others have suggested it occurs near 1030 cm where it is likely to be obscured by other absorptions [22]. Ryskin and Stavitskaya [46] prefer an assignment near 1280 cm and this has been supported by deuteration studies by Thomas [43]. However, it is clear that this absorption is of very much less use for identification than is the corresponding band of dimeric carboxylic acids. 

---