Bis(4-aminopyridinium) tetraiodidocadmate monohydrate

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 CdII 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 CdII 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—H...I, N—H...O and O—H...I hydrogen bonds and by π–π stacking interactions [centroid–centroid distance = 3.798 (3) Å) between pyridine rings, which build up a three-dimensional network.