Supramolecular ensembles with intermolecular hydrogen bonds: The synthesis and structure of (H2Phda)[SnF3]2 and (H2Bipy)[SnF6]

The structures of the compounds (H₂Phda)SnF₃]₂ (I) and (H₂Bipy)SnF₆] (II) have been determined. The main structural elements of I are anionic (SnF₃] _n ^n? ) polymer chains and 1,4-phenylenediamine (C₆H₄(NH₃)₂]²⁺) cations. The coordination polyhedron of Sn²⁺ is a trigonal bipyramid with a stereochemically active lone pair in the equatorial plane. The SnF₃E] _n ^n? chains are crosslinked by phenylenediamine cations through N-H...F hydrogen bonds, resulting in supramolecular ensembles. The structure of II is built of separate SnF₆]^2? complexes and 4,4′-bipyridinium ((C₁₀H₁₀N₂)²⁺) cations linked by bifurcate N-H...F hydrogen bonds. These bonds combine the SnF₆]^2? complexes into supramolecular layers alternating along the 100] direction with a period of 1/2a.