Acta Cryst. (2003). E59, o54-o56  [ doi:10.1107/S1600536802022699 ]

2-Amino-7-methoxy-3-(1-methyl-1H-benzimidazol-2-yl)chromenium perchlorate

V. N. Baumer, A. A. Karasev and Z. A. Sizova

Abstract: In the title compound, C₁₈H₁₆N₃O₂⁺·ClO₄^-, the almost planar cation contains bicyclic chromenone and benzimidazole moieties, which are rotated slightly relative to each other. The positive charge of the cation is located on the pyrilium ring and causes noticeable aromatization of the O-C and C-C bonds. One of the H atoms of the amino group is involved in an intramolecular hydrogen bond which closes the six-membered pseudo-ring in the cation. The second H atom of the amino group participates in a hydrogen bond with one of the O atoms of the perchlorate anion.

Online 19 December 2002

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