2,2':6',2''-Terpyridinium Trifluoromethanesulfonate, [terpyH](CF₃SO₃)

In the title compound, C₁₅H₁₂N₃⁺.CF₃O₃S^-, one terminal pyridine ring of the terpyridinium cation is protonated and forms an intramolecular N-H...N hydrogen bond of 2.646 (4) Å which stabilizes the cis, trans conformation in contrast to the trans, trans geometry of free terpyridine. An N-H...O hydrogen bond of 2.817 (5) Å connects the terpyridinium cations and trifluoromethanesulfonate anions.

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