Research Article: 2-[(2,4,4,6,6-Penta­chloro-1,3,5,2λ5,4λ5,6λ5-triaza­triphosphinin-2-yl)aza­nid­yl]pyridinium

Date Published: February 01, 2012

Publisher: International Union of Crystallography

Author(s): Safaa A. Ahmed, Rosenani A. Haque, Zulikha H. Zetty, Hoong-Kun Fun, Wan-Sin Loh.


The title compound, C5H5Cl5N5P3, crystallizes as a zwitterion in which the pyridine N atom is protonated. An S(6) ring motif is formed via an intra­molecular C—H⋯N hydrogen bond. The triaza­triphosphinine 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 mol­ecules into centrosymmetric dimers containing one R22(7) ring motif and two R22(8) ring motifs.

Partial Text

For background to the reactions of hexa­chloro­cyclo­triphosphazene, see: Polder & Wagner (1976 ▶). For a related structure, see: Coles et al. (2007 ▶). For ring conformations, see: Cremer & Pople (1975 ▶). For the stability of the temperature controller used in the data collection, see: Cosier & Glazer (1986 ▶).