Two packing motifs based upon chains of edge‐sharing PbI6 octa­hedra

The compounds catena‐polyp‐phenyl­enediammonium diiodo­lead(II)]‐di‐μ‐iodo] dihydrate], {(C₆H₁₀N₂)PbI₄]·2H₂O}_n, (I), and catena‐polybis­(3,5‐dimethyl­anilinium) diiodo­lead(II)]‐di‐μ‐iodo]], {(C₈H₁₂N)₂PbI₄]}_n, (II), crystallize as organic–inorganic hybrids. As such, the structures consist of chains of PbI₂]⁻ units extending along the c axis in (I) and along the b axis in (II). The asymmetric unit in (I) contains one Pb atom on a site of 2/m symmetry, two I atoms and a water molecule on mirror planes, and a p‐phenyl­enediammonium mol­ecule that sits around a site of 2/m symmetry with the C and N atoms on a mirror plane. In (II), the Pb atom is on a twofold axis and the two I atoms are on general positions. Each Pb atom is octa­hedrally coordinated to six I atoms, arranged as chains of edge‐sharing octa­hedra. Both compounds undergo hydrogen‐bonding inter­actions between the ammonium groups and the I atoms. In addition, there are hydrogen bonds between the water mol­ecules and the ammonium groups and halides in (I), and between the ammonium groups and the ring systems in (II).