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NdI3·9H2O contains Nd3+ ions bonded to water mol­ecules in a tricapped trigonal prismatic coordination geometry (coordination number 9).

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The room temperature single-crystal X-ray structure determination of the title compound, PrI3·9H2O, better represented as [Pr(OH2)9]I3, shows unequivocally that it belongs to the structure type preferably adopted by hydrates of the lighter rare earth iodides (La-Ho). The praseodymium cation is coordinated by nine water mol­ecules in the form of a tricapped trigonal prism with the metal atom situated on a site of crystallographic symmetry mm2.

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The asymmetric unit of the title compound, C7H11N2+·Br·H2O, consists of one crystallographically independent 1-ethyl-2,3-di­methyl­imidazolidinium cation, one bromide anion and one water mol­ecule, all of them located in general positions. In the crystal structure, the bromide anions and the water mol­ecules are connected via O—H...Br hydrogen bonding to form dimers which are located on centres of inversion. In addition, the cations are connected to the water mol­ecules via weak C—H...O hydrogen bonding.

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The asymmetric unit of the title compound, C8H18N+·I-, contains one crystallographically independent N-methyl-N-propyl­pyrrolidinium cation and one iodide anion, both located in general positions. No significant hydrogen bonding between the carbon-bound H atoms and the halide anion is observed.
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