3, 6-Bis(dimethylamino)-10-(10-iododecyl)acridinium iodide crystal study

The structural characterization of 3,6-Bis(dimethylamino)-10-(10-iododecyl) acridinium iodide is part of studies concerning the solid-state associations of acridine cationic dyes. The crystallographic study provides valuable information on the fine geometry of self-association processes in the solid state that is useful in modelling both self-aggregation in solution and intercalation phenomena with biological macromolecules. In this structure, the acridinium system displays the usual mirror symmetry about the central C9 N10 line. The alkyl chain at the N10 starts perpendicular to the ring plane and then bends sharply at the fourth C atom. Pairs of centrosymmetrically related cations overlap two of their rings and the dimethylamino groups are also partly involved in the overlap. Each I- ion is involved in short-range interactions with two cations giving rise to a 14-membered cyclic structure, which involves pairs of cations and anions across a crystallographic inversion centre.