K₃Sn₅Cl₃F₁₀ with a corrugated layered structure

Single crystals of K₃Sn₅Cl₃F₁₀, tri­potassium trichloro­deca­fluoro­penta­stannate(II), were isolated from a batch of needle-shaped crystals containing several potassium tin(II) fluorides, chlorides and chloride fluorides. The title compound crystallizes in the centrosymmetric space group Cmcm and the unit cell contains three crystallographically distinct tin units, with one SnF₃Cl₂E, in the unusual SnX₅E pseudo-octa­hedral coordination, while the other two are in an SnX₄E pseudo-trigonal bipyramid (E is a stereoactive lone pair). The SnF₃Cl₂ units form [SnF₂Cl₂]_n^2n- rows parallel to the a axis of the unit cell, sandwiched between rows of [Sn₂F₄]_n units also parallel to the a axis, with adjacent [Sn₂F₄]_n rows being held together by rows of Cl^- ions, also parallel to a. This ensemble forms [(Sn₂F₄)(SnF₂Cl₂)(Sn₂F₄)Cl]_n^3n- anionic planes parallel to ac. Two adjacent anionic planes, their terminal F atoms pointing towards each other, are held together by K⁺ ions and form bilayers. Each pair of adjacent bilayers is separated by a sheet of Sn lone pairs, making the structure highly layered.

Bis(3-carboxy­anilinium) hexa­fluoro­stannate(IV)

The title compound, (C₇H₈NO₂)₂[SnF₆], has been prepared from 3-amino­benzoic acid and tin(II) fluoride in hydro­fluoric acid. The structure can be described as alternating layers of SnF₆^2- and C₇H₈NO₂⁺ ions along the a axis, with the SnF₆^2- ions lying on a twofold axis. The cations and anions are linked to each other through strong hydrogen bonds formed by all H atoms covalently bonded to the N and O atoms. This three-dimensional complex network of hydrogen bonds reinforces the cohesion of the ionic structure.

Bis­(adeninium) hexa­chloro­stannate(IV) dichloride tetrahydrate

The structure of the title compound, (C₅H₇N₅)₂[SnCl₆]Cl₂·4H₂O, can be described as alternating layers of C₅H₇N₅²⁺ and [SnCl₆]^2- ions along the b axis, the Sn^IV atom lying on a twofold axis. The chloride ions are located between the organic entities, forming hydrogen bonds with the N atoms and water molecules. Layers of adeninium cations and hexa­chloro­stannate anions are linked by anion-cation, cation-water and water-water hydrogen bonds. This three-dimensional complex network of hydrogen bonds ensures the cohesion of the ionic structure.

Bis(cytosinium) hexa­chloro­stannate(IV)

The asymmetric unit of the title compound, (C₄H₆N₃O)₂[SnCl₆], contains one cytosinium cation and half a [SnCl₆]²⁻ anion, the anion lying on an inversion centre. The structure can be described as alternating layers of cytosinium and hexa­chloro­stannate ions along the c axis. The packing is stabilized by N—H...Cl and N—H...O hydrogen bonding, resulting in the formation of a two-dimensional network.