Libasse Diop

X-RAY STRUCTURE OF (SnMe3)SeO3 [SnMe3(H2O)]

The structure of (SnMe3)2Se03.H20 has been determined by an x-ray study. One tin atom forms part of a polymeric chain linked by O, O-bridging selenite ligands. A second Me3Sn moiety is pendant to this chain via the remaining selenite oxygen atom, and which also adopts a trigonal bipyramidal stereochemistry at tin through co-ordination of a water molecule. Hydrogen bonding links the polymeric chains into a three-dimensional network.

Infrared spectra of some polybasic acid triphenyltin IV derivatives

Abstract Triphenyltin IV polybasic acid derivatives have been synthesized, and structures suggested on the basis of their IR spectra. Tetrahedral oxoanions behave as polydentate ligands giving infinite type structures. The cleavage of these infinite type structures occurs when the derivatives react with strong Lewis bases giving discrete structure adducts. A particular type of coordination of the selenite (tetradentate) has been established.

SYNTHESIS, CHARACTERIZATION AND X-RAY STRUCTURE OF POLYMERIC [TRIPHENYLTIN(IV)][AQUATRIPHENYLTIN(IV)] SULPHATE, [(Ph3Sn)(H2OSnPh3)SO4]n

1 L a b o r a t o i r e de C h i m i e M i n e r a l e et A n a l y t i q u e ( L A C H I M I A ) , D e p a r t e m e n t de C h i m i e , Facul te^des S c i e n c e s et T e c h n i q u e s , U n i v e r s i t e Che ikh An ta D iop , D a k a r S e n e g a l 2 Ins t i tu to de Q u i m i c a , U n i v e r s i d a d N a c i o n a l A u t o n o m a de M e x i c o , C i r c u i t o Ex te r io r , C i u d a d Un ive r s i t a r i a , M e x i c o 0 4 5 1 0 , D. F., M e x i c o cakdiop@ucad.sn

Organotin phosphinates and arseniates R(2)SnA(2), R2Sn(Cl)A, Me3Sn(O2PPh2) (R = Me, Bu; A = Me2AsO2, Ph2PO2): Synthesis, IR, Raman, Mossbauer and NMR studies

Derivatives of general formulae R(2)SnA(2), R2Sn(Cl)A and Me3Sn(O2PPh2) (R = Me, Bu; A = Me2AsO2, Ph2PO2) have been synthesized and their elemental analyses performed. From the spectroscopic data (i. r., Raman, Mossbauer and NMR) polymeric structures containing symmetrically or unsymmetrically octahedral trans coordinated SnR2 residue and an infinite chain with a trigonal bipyramidal environment around the tin center for Me3Sn(O2PPh2) have been suggested.

CRYSTAL STRUCTURE OF BIS-(AQUATRIMETHYLSTANNYL)OXALATE [Me3Sn(H2O)]2C2O4

The structure of bis-(aquatrimethylstannyl)oxalate has been determined and found to contain metal atoms in a trans-02SnC3 environment. Each tin atom is bonded axially by one water and a monodentate oxalate, while the lattice structure is dominated by hydrogen bonds rather than intermolecular carboxylate bridges.

Crystal structure of bis-(2-methyl-1H-imidazol-3-ium) tetra-chlorido-cobaltate(II).

The tetrahedral tetrachloridocobaltate(II) anion is linked to bis(2-methyl-1H-imidazol-3-ium) cations through N—H⋯Cl hydrogen bonds, resulting in a layered arrangement parallel to (100).

[n-Bu2 NH2]3[SnPh3(SeO4)2]: the first triorganotin(IV) complex with terminally coordinated selenato ligands

Abstract The reaction of SeO4 H2 and SnPh3 OH in the presence of n-Bu2 NH led to the formation of [(n-Bu2 NH2)]3[SnPh3(SeO4)2] (1), which crystallizes in the orthorhombic space group P21 21 21 with Z=4, a=16.2509(7) Å, b=17.2412(8) Å, c=17.6881(5) Å, and V=4955.9(3) Å3. The structure of the novel trianion of 1 consists of a SnPh3 moiety trans-coordinated by two monodentate selenato ligands involving a trigonal bipyramid geometry around the Sn(IV) atom. The charges of [SnPh3(SeO4)2]3- are compensated by three [n-Bu2 NH2]+ cations. From a supramolecular point of view, the three uncoordinated oxygen atoms of each selenato ligand are involved in hydrogen bonding interactions with the surrounding di-n-butylammonium cations through N-H···O contacts, leading to a three-dimensional network. The structural characterization of salt 1 was completed by infrared and NMR spectroscopy and elemental analysis, which confirm the X-ray elucidation.

Tetra­kis(di­propyl­ammonium) tetra­kis(oxa­lato-κ2O1,O2)stannate(IV) mono­hydrate: a complex with an eight-coordinate SnIV atom

In the title salt, [(CH3CH2CH2)2NH2]4[Sn(C2O4)4]·H2O, the SnIV 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—H⋯O hydrogen bonds, forming a three-dimensional network. This network is futher stabilized by weak O—H⋯O hydrogen bonds involving the water molecules and oxalate O atoms. The crystal studied was refined as an inversion twin.

Tetra­methyl­ammonium aqua­trichlorido­oxalatostannate(IV) monohydrate

The SnIV atom in the title compound, [(CH3)4N][Sn(C2O4)Cl3(H2O)]·H2O, obtained from the reaction between SnCl4 and [(CH3)4N]2C2O4·2H2O, is six-coordinated by three Cl atoms, an O atom of a water molecule and two O atoms from an asymmetrically chelating oxalate anion. The environment around the SnIV atom is distorted octahedral. The anions are connected by the lattice water molecule through O—H⋯O hydrogen bonds, leading to a layered structure parallel to (010). The cations are located between these layers and besides Coulombic forces are connected to the anionic layers through weak C—H⋯O and C—H⋯Cl interactions.

Crystal and molecular structure of diorganoammonium oxalatotrimethylstannate, [R2NH2][Me3Sn(C2O4)] (R=i-Bu, cyclohexyl)

Abstract The title compounds [R2NH2][C2O4SnMe3](R=i-Bu, Cy), in which tin atoms adopt a distorted trigonal bipyramidal configuration, have been prepared and submitted to an X-ray diffraction study. These compounds have been obtained from the reaction of (Cy2NH2)2C2O4·H2O or (i-Bu2NH2)2C2O4 with SnMe3Cl. In both [R2NH2][C2O4SnMe3] compounds, the trans complex has an almost regular trigonal bipyramidal geometry around the tin atom. The SnMe3 residues are connected as a chain with bridging oxalate anions in a trans-SnC3O2 framework, the oxygen atoms being in axial positions. The cations connect linear adjacent chains through NH…O hydrogen bonds giving layered structures.