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Structures of the two tris-quaternary ammonium scaffolds A (1,3,5-tri-{5-[1-(ammonium)-pent-1-ynyl}benzene) and B (1,3,5-tri-{5-[1-(ammonium)-pentyl}benzene); TRIS-1 scaffold A, NR3 = 3-picolinium; TRIS-2 scaffold A, NR3 = 2-picolinium; TRIS-3 scaffold B, NR3 = 3-picolinium.
