Abstract
The title compound, C19H14N5+·ClO4−·H2O, contains planar C19H14N5+ cations, perchlorate anions and water molecules. The two closest parallel cations (plane-to-plane distance of 3.41 A), together with two neighbouring perchlorate anions and two water molecules, form an electrically neutral quasi-dimeric unit. Two acidic H atoms of the cation, both H atoms of the water molecule, the N atoms of the imidazole rings and three of the four O atoms of the perchlorate anion are involved in the hydrogen-bonding network within the dimeric unit. The remaining third acidic H atom of the imidazole rings and the water molecules complete a two-dimensional network of hydrogen bonds, thus forming puckered layers of dimers. The angle between the planes of two neighbouring dimeric units in the same layer is 33.25 (3)°.
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