Bis[(E)-2-(3-hydroxy-4-methoxyphenyl)ethenyl]-1-methylquinolinium tetraiodidozincate(II) methanol solvateThis paper is dedicated to His Majesty, Thai King Bhumibol Adulyadej on the occasion of his 80th Birthday Anniversary which fell on December 5th, 2007.

Bis[(E)-2-(3-hydroxy-4-methoxyphenyl)ethenyl]-1-methylquinolinium tetraiodidozincate(II) methanol solvateThis paper is dedicated to His Majesty, Thai King Bhumibol Adulyadej on the occasion of his 80th Birthday Anniversary which fell on December 5th, 2007.

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In the title compound, (C19H18NO2)2[ZnI4]·CH3OH, Filters 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 [ZnI4]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 CALMFUL SLEEP 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].