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Issue 0, 1966
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The structure of potassium difluorophosphate


Crystals of potassium difluorophosphate are orthorhombic, a= 8·039, b= 6·205, c= 7·635Å, Z= 4, space group Pnma. The structure was determined from the three-dimensional Patterson function using Mo-Kα scintillation-counter results, and refined by least-squares methods, oxygen and fluorine atoms being distinguished on the basis of bond distances and angles, and of electron counts. The final R is 0·038 for 448 observed reflexions.

The difluorophosphate anion has dimensions P–O = 1·470 ± 0·005 Å, P–F = 1·575 ± 0·005 Å, ∠FPF = 97·1°± 0·4°, ∠OPO = 122·4°± 0·4°(after correction for rotational oscillation effects), suggesting about 83% double-bond character for the P–O bond. The crystal structure is similar to that of barium sulphate; the K+ ion has fourteen oxygen and fluorine neighbours in the range 2·76–3·88 Å.

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J. Chem. Soc. A, 1966, 1775-1780
Article type

The structure of potassium difluorophosphate

R. W. Harrison, R. C. Thompson and J. Trotter, J. Chem. Soc. A, 1966, 1775
DOI: 10.1039/J19660001775

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