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The crystal structure of the title compound, (C6H7FN)2[CuCl4], consists of parallel two-dimensional perovskite-type layers of corner-sharing CuCl6 octa­hedra. These are bonded together via N—H...Cl hydrogen bonds from the 4-fluoro­anilinium chains, which are almost perpendicular to the layers. The CuCl4 dianions have two short Cu—Cl bonds [2.2657 (15) and 2.2884 (13) Å] and two longer bonds [2.8868 (15) Å], giving highly Jahn–Teller-distorted CuCl6 octa­hedra. The Cu atoms are situated on crystallographic centers of inversion.

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There are two independent mol­ecules in the asymmetric unit of the title compound, C21H21NO2, which was synthesized by the one-pot reaction of 2-naphthol, morpholine and benzaldehyde. The dihedral angles between the naphthalene ring systems and the benzene rings are 84.03 (7) and 75.76 (8)° in the two mol­ecules and an intra­molecular O—H...N hydrogen bond occurs in each independent mol­ecule.

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In the title melaminium salt, 2,4,6-triamino-1,3,5-triazin-1-ium iodide monohydrate, C3H7N6+·I·H2O, the components are linked via N—H...O, N—H...N, O—H...I and N—H...I hydrogen bonds. All of the H atoms of the melaminium cation are involved in hydrogen bonds. The melaminium cations are inter­connected by four N—H...N hydrogen bonds, forming ribbons along [111]. The water mol­ecules connected by N—H...O hydrogen bonds also form part of these ribbons. The ribbons are inter­connected by other hydrogen bonds (O—H...I and N—H...I), as well as by π–π inter­actions [centroid–centroid distance = 3.6597 (17) Å].

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In the title hydrated salt, 2,4,6-triamino-1,3,5-triazin-1-ium perchlorate monohydrate, C3H7N6+·ClO4·H2O, the constituents are linked via hydrogen bonds of the O—H...O, N—H...O, N—H...N and N—H...Cl types. All the H atoms of the melaminium cation are involved in the hydrogen bonds. The melaminium residues are inter­connected by four N—H...N hydrogen bonds, forming chains parallel to (111). The ribbons are inter­connected by other hydrogen bonds as well as by π–π inter­actions [centroid–centroid distance = 3.8097 (7) Å].
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