Waly Diallo

[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.

X-ray structure of HSeO3SnMe2Cl

Abstract When H2SeO3 is allowed to react with SnMe2Cl2 in EtOH at a 1:2 ratio colorless crystals of HSeO3SnMe2Cl are obtained which have been characterized by X-ray crystallography. The compound crystallizes in triclinic space group P1 with cell parameters a=6.9693(5) Å, b=7.5096(4) Å, c=7.5222(5) Å, α=71.503(4)°, β=75.826(3)°, γ=87.114(4)°, Z=2, V=361.82(4) Å3. The structure consists of [Me3SnO3SeH]n chains in which Me3Sn units are bridged by the selenite ligand; chains are further linked into sheets by O—H----Cl bonds. The key role of hydrogen bonds is worth emphasizing.

New selenito SnPh3 residue containing complexes and adducts: Synthesis and spectroscopic studies

Ten organotin selenito compounds obtained on allowing Se03(SnPh3)2 to react with triphenylphosphine oxyde, urea and tetraphenylphosphoniumtetramethylammoniumacetonyltriphenylphosphoniumand tetraethylammonium halides or pseudo halides have been studied by infrared and Mössbauer spectroscopies, then discrete and infinite chains structures suggested on the basis of spectroscopic data.

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 SnIV 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).

Crystal structure of di­methyl­ammonium hydrogen oxalate hemi(oxalic acid)

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.

Reactivity of bis(cyclohexylammonium) 4-nitrophenylphosphate with SnMe3Cl. X-ray structure of 4-NO2 C6 H4 PO4(SnMe3)2·H2O

Abstract The reaction of bis(cyclohexylammonium) 4-nitrophenylphosphate with Me3 SnCl (1:2) under reflux in ethanol yielded the title compound 4-NO2 C6 H4 PO4(SnMe3)2·H2 O (1). The X-ray crystallographic analysis achieved on single crystals obtained by slow evaporation at room temperature revealed the formation of an unexpected supramolecular coordination network. The elementary building block can be viewed as two Me3 Sn moieties linked by a bridging 4-nitrophenylphosphate ligand. The two tin atoms are five-coordinated and describe a trans-Me3 SnO2 geometry in a trigonal bipyramidal arrangement. However, the Sn atoms are distinct, exhibiting two different environments. Thus, one is linked to two axial oxygen atoms from two distinct phosphato groups, whereas the other is bound to one phosphato oxygen atom and to a water molecule. From a supramolecular point of view, the combination of the tridentate binding mode of 4-NO2 C6 H4 PO4 and the additional formation of intermolecular hydrogen bonding interactions between NO2/H2 O and PO4/H2 O groups gives rise to a three-dimensional lattice network.

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+·C2O4 2−·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 SnIV 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).

Synthesis, spectroscopic study, and crystal structure of a new organotin(IV) selenate derivative

Abstract The polymeric organotin(IV) selenate complex [(Me3Sn)3(SeO4)(OH)]n (1) has been isolated as single crystals from the reaction of [(Me2NH2)2SeO4] and Me3SnCl in methanol. In the solid state, compound 1 was characterized by X-ray diffraction analysis, Fourier transform-infrared spectroscopy, and elemental analysis. 1 crystallizes in the orthorhombic system space group Pbca with a=11.0231(2) Å, b=16.3461(3) Å, c=20.9945(4) Å, α=β=γ=90°, V=3782.89(12) Å3, and Z=8. Its structure can be described as a polymeric zigzag chain based on Me3Sn moieties linked by tridentate selenate anions. Pendant (Me3Sn)2OH groups are also connected to the chain, according to a syndiotactic organization, and via Sn-O-Se bonds. Intermolecular OH···O hydrogen bonds and long Se-O···Sn distance interactions promote the association of chains together and lead to the propagation of a three-dimensional network. In addition, the behavior of 1 in solution (methanol) was also studied by multinuclear nuclear magnetic resonance spectroscopy and mass spectrometry.

Tri-benzyl-ammonium chloride.

Single crystals of the title salt, C21H21NH+·Cl−, were isolated as a side product from the reaction involving [(C6H5CH2)3NH]2[HPO4] and Sn(CH3)3Cl in ethanol. Both the cation and the anion are situated on a threefold rotation axis. The central N atom in the cation has a slightly distorted tetrahedral environment, with angles ranging from 107.7 to 111.16 (10)°. In the crystal, the tribenzylammonium cations and chloride anions are linked through N—H⋯Cl and C—H⋯Cl hydrogen bonds, leading to the formation of infinite chains along [001]. The crystal studied was a merohedral twin.

New Sulphato Organotin (IV) Derivatives and Adducts: Synthesis and Spectroscopic Studies

Six sulphato derivatives and adducts containing SnPh3 or SnR2Cl (R=Bu, Ph) groups have been synthesized and studied by infrared and Mossbauer techniques. The suggested structures are infinite chains or oligomers, the sulphate behaving as a mono- bi-, tridentate, mono- or bichelating ligand.