Structures of ionic di(arenesulfonyl)amides.: 8.: Sodium bis[di(4-fluorobenzenesulfonyl)amido-N]argentate:: A heterobimetallic complex exhibiting a lamellar layer structure and short C-H•••F-C interlayer contacts

Na[Ag{N(SO2-C6H4-4-F)(2)}(2)] (monoclinic, C2/c, Z' = 1/2) is the first heterobimetallic representative in a well-documented class of layered inorgano-organic solids where the inorganic component is comprised of metal cations and coordinating N(SO2)(2) groups and the outer regions are formed by the aromatic rings of the di(arenesulfonyl)amide entities, which adopt a folded conformation approximating to mirror symmetry. The inversion-symmetric bis(amido)argentate unit of the novel compound displays an exactly linear N-Ag-N core and short Ag-N bonds of 217.55(17) pm (at -140 degrees C); the coordination number of the silver ion is extended to 2 + 6 by four internal and two external Ag...O secondary interactions. The polar lamella is constructed from rows of Na+ ions located on twofold axes, alternating with bis(amido)argentate strands reinforced by Ag...O interactions and weak C-H...O hydrogen bonds; Na+ is embedded in an 06 environment. Adjacent layers are cross-linked via short C-H...F-C contacts suggestive of weak hydrogen bonding enhanced by cooperativity.