Nature of the P–O bond in diphenylphosphonic acid: experimental charge density and electron localization function analysis

Analysis of the electron density function and the ELF on the basis of the high resolution diffraction X-ray investigation of Ph₂P(O)OH at 110 K have revealed that, in the vicinity of the oxygen atom of the P=O group, three lone pairs in an antiperiplanar orientation in respect to OH and Ph substituents are localised.