ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The crystal structure of ammonium chlorochromate

F. Hanic and J. Maďar

Slovak Academy of Sciences, Bratislava

Abstract: The unit cell of NH₄CrO₃Cl is monoclinic and has the dimensions: a = 7.77 A.,b = 7.72, c = 7.96, β = 90°27', and Z = 4. The space group is P21/c. The structure was detd. by Patterson's projection P(u,v) and P(u,w). The positions of the individual atoms were identified more accurately by the calcn. of the projection of electron ds. into the planes (001) and (010) and by the application of the method of least squares. A complete analogy with KCrO₃Cl was established. The structure of NH₄CrO₃Cl was compared with the structure of NH₄CrO₃F and KCrO₃F, and a possible contraction of the Cr-O bond in CrO₃X^- was discussed. From the crystal structure of NH₄CrO₃Cl a macroscopic form of crystals was derived.

Full paper in Portable Document Format: 102a81.pdf (in Slovak)

Chemical Papers 10 (2) 81–90 (1956)