Acta Cryst. (2012). E68, m1160-m1161
[ doi:10.1107/S1600536812034447 ]

Bis(4-aminopyridinium) tetraiodidocadmate monohydrate

Q. Sun, S. Liao, J. Yao, J. Wang and Q. Fang

Abstract: The title compound, (C₅H₇N₂)₂[CdI₄]·H₂O, contains one [CdI₄]^2- anion, two prontonated 4-aminopyridine molecules and one water molecule in the asymmetric unit. In the anion, the Cd^II atom is coordinated by four I atoms in a slightly distorted tetrahedral geometry. The [CdI₄]^2- anion and the water molecule are bisected by a crystallographic mirror plane perpendicular to the c-axis direction, with the Cd^II atom, two of the I atoms and the atoms of the water molecule located on this plane. The crystal packing is stabilized by intermolecular N-HI, N-HO and O-HI hydrogen bonds and by - stacking interactions [centroid-centroid distance = 3.798 (3) Å) between pyridine rings, which build up a three-dimensional network.

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