Figure 1 A fragment of a cationic ribbon of the title compound with atom labelling scheme and 50% probability displacement ellipsoids. Symmetry code: i -x, y, -z + [{1\over 2}]; ii x, -y + 2, z - [{1\over 2}]; iii x, -y + 2, z + [{1\over 2}]; iv -x, -y + 2, z + 1.  [article HTML]