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The title compound, {[CuI(bpe)]·0.25(bpe)} n , was synthesized similarly to (CuI) 2 (bpe) [Neal  et al.  (2019).  IUCrData ,  4 , x190122] with red crystals grown from acetonitrile solutions of CuI and the bpe ligand [bpe = 1,2-bis(pyridin-4-yl)ethene, C 12 H 10 N 2 ]. The structure of the title compound is a type 1 complex in the Graham nomenclature [Graham  et al.  (2000).  Inorg. Chem .  39 , 5121–5132], having rhombic dimers of Cu 2 I 2  that are bridged by two bpe ligands, to form oligomeric ribbons arranged as stairsteps. The step height is 2.8072 (11) Å, which is the Cu—I i  distance of the dimer [symmetry code (i): 1 −  x , 2 −  y , 1 −  z ]. The resulting polymer displays a two-dimensional honeycomb framework along the (01\overline1) plane, and disordered free bpe molecules fill the voids in the crystal.

iucrdata

Poly[[[μ-trans-1,2-bis(pyridin-4-yl)ethene-κ2N:N′]-μ-iodido-copper(I)]–trans-1,2-bis(pyridin-4-yl)ethene (1/0.25)]