title: 2-[(2,4,4,6,6-Penta-chloro-1,3,5,2λ,4λ,6λ-triaza-triphosphinin-2-yl)aza-nid-yl]pyridinium.
abstract: The title compound, C(5)H(5)Cl(5)N(5)P(3), crystallizes as a zwitterion in which the pyridine N atom is protonated. An S(6) ring motif is formed via an intra-molecular C-H⋯N hydrogen bond. The triaza-triphosphinine ring adopts an envelope conformation, with one N atom displaced by 0.145 (1) Å from the other atoms. In the crystal, N-H⋯N and C-H⋯N hydrogen bonds link the mol-ecules into centrosymmetric dimers containing one R(2) (2)(7) ring motif and two R(2) (2)(8) ring motifs.
authors.forename: Safaa A
authors.initials: SA
authors.lastname: Ahmed
authors.forename: Rosenani A
authors.initials: RA
authors.lastname: Haque
authors.forename: Zulikha H
authors.initials: ZH
authors.lastname: Zetty
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun
authors.forename: Wan-Sin
authors.initials: WS
authors.lastname: Loh