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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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