A single-crystal X-ray analysis has shown that the magnetically dilute complex [Hpy]2[CrBr4·2H2O], where Hpy is the pyridinium cation, contains discrete trans-planar CrBr2(OH2)2 units and bromide ions instead of the expected distorted octahedral anions, trans-[CrBr4(OH2)2]2–. The bromide ions are held by strong hydrogen bonds to the pyridinium cations.
M. F. C. Ladd, L. F. Larkworthy, G. A. Leonard, D. C. Povey and S. S. Tandon, J. Chem. Soc., Dalton Trans., 1984, 2351 DOI: 10.1039/DT9840002351
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