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The title compound C 11 H 19 N 2  · PF 6  crystallises in the monoclinic space group  C 2/ m  (no. 12) with  a  = 1234.4 pm,  b  = 942.8 pm,  c  = 717.6 pm,  β  = 109.95°,  Z  = 2 and  D  x  = 1.372 g cm −3 .  R  = 0.08 for 627 unique reflections with  I  &gt; 2σ( I ) at 298 K. The cation as well as the anion are disordered. A polarization of the polymethine system by the counterion is not observed, because the dye molecule exhibits a symmetrical polymethine structure. The chromophores are closely stacked in one-dimensional staircase aggregates which are separated by the counterions. Their parallel arrangement in the unit cell should lead to only one transition dipole moment.

One-dimensional staircase aggregates in crystals of 1,7-bis(dimethylamino)heptamethinium hexafluorophosphate, a polymethine dye