Bis(di-2-pyridylamine-κ2N2,N2')silver(I) trifluoromethanesulfonate: polar arrangement of trifluoromethanesulfonate anions in a pseudo-centrosymmetric framework of coordination cations.
The asymmetric unit of the title compound, [Ag(C(10)H(9)N(2))(2)]CF(3)SO(3) or [Ag(dpa)(2)]OTf (dpa is di-2-pyridylamine and OTf is the trifluoromethanesulfonate anion), contains two [Ag(dpa)(2)](+) coordination cations and two OTf anions. The coordination geometry of the Ag(I) atom is intermediate between square-planar and tetrahedral, with similar deformations at the two symmetry-independent metal centres. The dpa ligands coordinate in a bidentate chelating mode. The OTf anions are in the outer coordination sphere and bridge the coordination cations via N-H...O interactions to form two symmetry-independent hydrogen-bonded chains. The [Ag(dpa)(2)](+) cations are arranged via interactions involving the aromatic groups into a pseudo-centrosymmetric three-dimensional framework with two types of channels, each confining congeners of one of the symmetry-independent anions. The most interesting feature of this structure is its bulk polarity resulting from an approximately parallel alignment of the anions in the channels.
Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznań, Poland.
Magdalena
M
Żyto
Barbara
B
Wicher
Maria
M
Gdaniec