Abstract
The reaction of uranyl nitrate hexahydrate with 4-halopyridinium ions (X = Cl, Br, I) in high chloride media has resulted in three novel compounds, each of which is based around the [UO2Cl3(NO3)]2− tecton; (C5H5NCl)2[UO2Cl3(NO3)], (C5H5NBr)2[UO2Cl3(NO3)] and (C5H5NI)3[UO2Cl3(NO3)](NO3). In each material the halogen is involved in various forms of intermolecular interaction, including hydrogen bonding, halogen–halogen interactions and halogen–nitrate interactions. Presented is a discussion of the role of the halogen, in terms of Lewis acidity, in directing the overall structure.
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