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.
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