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

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 Ag⋯F 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 Ag⋯F 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.