Bis[(E)-2-(3-hydr­oxy-4-methoxy­phen­yl)ethen­yl]-1-methyl­quinolinium tetra­iodidozincate(II) methanol solvate

In the title compound, (C(19)H(18)NO(2))(2)[ZnI(4)]·CH(3)OH, each cation is nearly planar and exists in an E configuration, the dihedral angles between the quinolinium systems and the benzene rings being 1.78 (10) and 5.44 (10)° for the two cations. The [ZnI(4)](2−) anion displays a very slightly distorted tetra­hedral geometry. There are intra­molecular O—H⋯O hydrogen bonds between the hydr­oxy and meth­oxy groups in each cation which generate S(5) ring motifs. In the crystal structure, cations are linked together by O—H⋯O hydrogen bonds and weak C—H⋯O inter­actions, whereas the anions are linked to the cations through weak C—H⋯I inter­actions. The asymmetric unit also contains a methanol solvent mol­ecule which is linked to one of the cations by an O—H⋯O hydrogen bond and the anion through an O—H⋯I hydrogen bond. The crystal is further stabilized by C—H⋯π and π–π inter­actions [centroid–centroid distances 3.6054 (15) and 3.6057 (15) Å].