Poly[diaqua­(μ₄-carboxyl­atomethyl­phospho­nato)(μ₄-carb­oxy­methyl­phospho­nato)penta­deca­methyl­penta­tin(IV)]

The central Sn^IV atom of the penta­nuclear title complex, {[Sn(CH₃)₃]₃O₂C(CH₂)PO₃[Sn(CH₃)₃(H₂O)]₂HO₂C(CH₂)PO₃}, is located on a twofold rotation axis; due to symmetry, the H atom of the carboxyl group of the anion is disordered with a site occupancy of 0.5. The central Sn^IV atom is bonded to three methyl groups (one of which is disordered about the twofold rotation axis) and is symmetrically trans coordinated by two phospho­nate groups with Sn—O = 2.2665 (12) Å while the other SnMe₃ residues are asymmetrically trans coordinated with Sn—O = 2.1587 (12) and 2.3756 (13) Å for one residue and Sn—O = 2.1522 (12) and 2.4335 (12) Å for the other; the Sn–O distances involving two O atoms trans to carboxyl­ate are longer than those trans to phospho­nate groups. The Sn—C distances lie in a very narrow range [2.112 (2)–2.133 (3) Å]. The oxyanion behaves as a tetra-coordinating ligand. The bridging mode of the latter leads to the formation of layers parallel to (001) that are inter­connected by O—H...O and C—H...O hydrogen bonds.

Bis(cyclo­hexyl­ammonium) tetra­chlorido­(oxalato)stannate(IV)

The title salt, (C₆H₁₄N)₂[Sn(C₂O₄)Cl₄], was obtained as a by-product from the reaction between 2C₆H₁₄N⁺·C₂O₄²⁻·1.5H₂O and SnCl₂·2H₂O. The cyclo­hexyl­ammonium cation has a chair conformation. The complex anion consists of an oxalate anion chelating the SnCl₄ moiety, resulting in a distorted octa­hedral coordination sphere of the Sn^IV atom with the O atoms in equatorial cis positions. In the crystal, cations and anions are linked through N—H...O and N—H...Cl inter­actions into a layered arrangement parallel to (100).

Tris(cyclo­hexyl­ammonium) cis-di­chlorido­bis­(oxalato-κ²O¹,O²)stann­ate(IV) chloride monohydrate

The crystal structure of the title compound, (C₆H₁₄N)₃[Sn(C₂O₄)₂Cl₂]Cl·H₂O, contains three cyclo­hexyl­ammonium cations, one stannate(IV) dianion, one isolated chloride anion and one lattice water mol­ecule. The cyclo­hexyl­ammonium cations adopt chair conformations. In the complex anion, two bidentate oxalate ligands and two chloride anions in cis positions coordinate octa­hedrally to the central Sn^IV atom. The cohesion of the mol­ecular entities is ensured by the formation of N—H...O, O—H...O, O—H...Cl and N—H...Cl inter­actions involving cations, anions and the lattice water mol­ecule, giving rise to a layer-like arrangement parallel to (010).