(IUCr) Crystallography Journals Online

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Acta Cryst. (2005). E61, m404-m406 [ doi:10.1107/S1600536805002618 ]

Bis[-4'-(2-pyridyl)-2,2':6',2''-terpyridine]disilver(I) bis(hexafluorophosphate)

L. Hou, D. Li and S. W. Ng

Abstract: The Ag atoms and the ligands of the dication in the title compound, [Ag₂(C₂₀H₁₄N₄)₂](PF₆)₂, are disordered; the dication lies on a center of symmetry. The major component is chelated by two N atoms of the heterocycle and is coordinated by the N atom of the pyridyl substituent of the other heterocycle; the geometry is trigonal planar distorted towards tetrahedral owing to a weak AgF interaction. The minor component is chelated by three N atoms and is also coordinated by the N atom of the pyridyl substituent of the inversion-related heterocycle; its geometry is octahedral owing to two AgF interactions. One anion lies on a special position of site symmetry 2 and the other on a special position of site symmetry $\overline 1$ . The disorder in the centrosymmetric dication is best described in terms of the Ag atom being disordered over two sites and the C₅H₂N ring of the heterocycle being rotated by about 180°; the two dications are superimposed in the crystal structure.

Online 29 January 2005