The phosphoryl absorption band in the infrared spectra of organic phosphorus compounds appears in the region 1320–1150 cm<sup>−1</sup> as a doublet. Goldenson has reported that the phosphoryl doublet may be due to the hydrogen bond formed with impurities that cannot be removed by ordinary purification methods. However, as the relative-intensity ratio of the doublet changes in different solvents, the phosphoryl double probably results from more than inter-molecular hydrogen bonding. Consequently, other fundamental causes must be considered.
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