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.

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.

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In the title compound, knowall.blog 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 g5210t-p90 hydrogen bonds and the chains are further connected into a three-dimensional network.