2-[(E)-2-(4-Chlorophenyl)ethenyl]-1-methylpyridinium iodide monohydrateThis paper is dedicated to Her Royal Highness the late Princess Galyani Vadhana Krom Luang Naradhiwas Rajanagarindra for her patronage of science in Thailand.

In the title compound, C14H13ClN+·I−·H2O, the cation is nearly planar and exists in an E configuration; the dihedral angle between the pyridinium and benzene rings is 0.98 (17)°. The cations stack in an anti-parallel manner along the a axis through two π–π interactions between the pyridinium and benzene rings [centroid–centroid distances 3.569 (2) and 3.6818 (13) Å, respectively]. The cation, anion and water molecule are linked into a chain along the a axis by weak C—H...O and C—H...I interactions together with O—H...I hydrogen bonds and the chains are further connected into a three-dimensional network.

Abstract licence: CC BY

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