The structure of C 2 O 4 (SnPh 3 ) 2 . 2dimethylformamide (DMF) has been determined by X-ray. It consists of monomers containing SnPh 3 residue trans coordinated by DMF, with the environment around the tin centre being trigonal bipyramidal.
The title compound, (C14H16N)[Sn(C6H5)3(C2O2)], was synthesised by allowing C2O4(Bz2NH2)2 (Bz = benzyl) to react with SnPh3Cl. The asymmetric unit is built up by four SnPh3C2O4 anions and four Bz2NH2 cations which are related by a pseudo-inversion centre. Each SnIV cation is five-coordinated by the three phenyl groups and two O atoms belonging to the chelating oxalate ligand; the coordination geometry is that of a distorted trigonal bipyramid. Anions and cations are linked through N—H⋯O hydrogen bonds into a layer structure parallel to (001). Moreover, the anion–cation pairs are associated by two bifurcated N—H⋯O hydrogen bonds, generating pseudo-dimers. One of the phenyl groups of one anion is disordered over two sets of sites in a 0.69:0.31 ratio. The Flack parameter value of 0.44 (1) indicates racemic twinning.
Key indicators: single-crystal X-ray study; T = 173 K; mean (C-C) = 0.006 Å; disorder in solvent or counterion; R factor = 0.021; wR factor = 0.054; data-toparameter ratio = 12.4.In the title salt, [(CH 3 CH 2 CH 2 ) 2 NH 2 ] 4 [Sn(C 2 O 4 ) 4 ]ÁH 2 O, the Sn IV atom of the stannate anion is located on a special position with 42m symmetry. It is eight-coordinated by four chelating oxalate anions. The dipropylammonium cation possesses mirror symmetry while the lattice water molecule is disordered about a position with 42m symmetry and has an occupancy of 0.25. In the crystal, the anions and cations are linked by N-HÁ Á ÁO hydrogen bonds, forming a threedimensional network. This network is futher stabilized by weak O-HÁ Á ÁO hydrogen bonds involving the water molecules and oxalate O atoms. The crystal studied was refined as an inversion twin.
The structure of the title compound, (C12H24N)2[Sn2(C6H5)4(C2O4)3(H2O)2], consists of a bischelating oxalate ion, located on an inversion center, which is linked to two SnPh2 groups. The coordination sphere of the Sn(IV) ion is completed by a monochelating oxalate anion and a water molecule. The Sn(IV) atoms are thus seven-coordinated. The discrete binuclear units are further connected by hydrogen bonds, leading to a supramolecular crystal structure. The asymmetric unit contains one half dianion and one (Cy2NH2)+ cation.
The title salt consists of a dimethylammonium cation (Me2NH2
+), an hydrogenoxalate anion (HC2O4
−), and half a molecule of oxalic acid (H2C2O4) situated about an inversion center. They are linked together through intermolecular hydrogen bonds, forming a two-dimensional bilayer-like self-assembly.
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