Single crystal neutron diffraction at 77 and 5·5 K shows that the Cl atoms in the basal plane in Rb2CrCl4 are moved 0·16 Å from the midpoint of the line joining adjacent Cr atoms giving tetragonally elongated CrCl6 with principal axes alternately along [011] and [0![[1 with combining macron]](https://www.rsc.org/images/entities/char_0031_0304.gif)
1] of the D2h18(Cmca) unit cell; this is the microscopic origin of the ferromagnetic exchange.
P. Day, M. T. Hutchings, E. Janke and P. J. Walker, J. Chem. Soc., Chem. Commun., 1979, 711 DOI: 10.1039/C39790000711
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