Crystal structure of a helical silver(I) coordination polymer based on an unsymmetrical dipyridyl ligand: Catena-poly[[silver(I)-μ-N-(pyridin-4-ylmethyl)pyridine-3-amine-κ2 N:N′] tetrafluoridoborate methanol hemisolvate]

초록

The asymmetric unit of the title compound, {[AgL]·BF<inf>4</inf>·0.5CH<inf>3</inf>OH} n , L = N-(pyridin-4-ylmethyl)pyridine-3-amine, C<inf>11</inf>H<inf>11</inf>N<inf>3</inf>, contains one AgI ion, one ligand L, one tetrafluoridoborate anion disordered over two orientations in a 0.669 (13):0.331 (13) ratio and one half of a methanol solvent molecule situated on an inversion center. Each AgI ion is coordinated by two N atoms from two L ligands in a distorted linear geometry [N - Ag - N = 174.70 (19)°]. Each L ligand bridges two AgI ions, thus forming polymeric helical chains propagating in [010]. In the crystal, Ag⋯Ag [3.3369 (10) Å] and π-π interactions between the aromatic rings [centroid-to-centroid distance = 3.676 (4) Å] link these chains into layers parallel to (10-1). Ag⋯F and weak N(C) - H⋯F interactions further consolidate the crystal packing.

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