catena-Poly[N-[4-(1H-benzimidazol-3-yl)but­yl]benzimidazolium [[diiodo­bismuthate(III)]-di-μ₂-iodo]]

In the title compound, {(C₁₈H₁₉N₄)[BiI₄]}_n, the organic cation is protonated on one of the two tertiary imino N atoms; the cation has inversion symmetry, involving disorder of this H atom. Adjacent cations are linked by a disordered N—H...N hydrogen bond, forming a chain that runs along the a axis of the monoclinic unit cell. The anion exists as a polymeric chain that propogates along the c axis; the Bi atom lies on a special position of site symmetry 2.

catena-Poly[[diiodo­cadmium(II)]-μ-1,4-bis­(1,2,4-triazol-1-ylmeth­yl)benzene-κ²N⁴:N^4′]

The title compound, [CdI₂(C₁₂H₁₂N₆)]_n, is a polymeric 1:1 adduct of cadmium iodide and 1,4-bis­(1,2,4-triazol-1-yl­methyl)­benzene. The Cd and I atoms lie on special positions of m site symmetry and the complete organic ligand has inversion symmetry. The polymer assumes a zigzag conformation propagating along the c axis. The geometry at Cd is that of a CdI₂N₂ tetra­hedron.

catena-Poly[4,4′-bipyridinium(+) [argentate(I)-di-μ-iodo]]

In the crystal structure of the title compound, {(C₁₀H₉N₂)[AgI₂]}_n, both the cation and anion adopt chain motifs. A hydrogen bond links the positively charged pyridinium end of one cation to the neutral pyridyl end of an adjacent cation; the anions are bridged by two I atoms into a zigzag chain. The Ag atom in the chain exists in a nearly regular tetra­hedral environment, on a special position of site symmetry 2.

2,3-Di-4-pyridylbutane-2,3-diol

The mol­ecule of the title compound, C₁₄H₁₆N₂O₂, lies on a centre of inversion located at the mid-point of the central C—C bond. O–H...N hydrogen bonds link adjacent mol­ecules into a layer motif.