| Summary: | The asymmetric unit of the title compound, C8H12N+·ClO4−.C12H24O6, contains one half of the cationic [(C2H5—C6H4—NH3)(18-crown-6)]+ moiety and one half of the ClO4− anion. Two O atoms of the crown ether, four C atoms and the N atom of the ethylanilinium unit and the Cl and two O atoms of the anion lie on a mirror plane. In the crystal structure, the –NH3+ group lies in the 18-crown-6 ring, forming a supramolecular rotator–stator-like structure linked by intramolecular N—H...O hydrogen bonds. The six O atoms of the crown ether lie approximately in a plane, the mean deviation being 0.1771 (3) Å; the N atom lies approximately 0.855 (3) Å from the centroid of the crown ether ring.
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