Libasse Diop

Cheikh Anta Diop University, Dakar, Dakar, Dakar, Senegal

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Publications (90)35.43 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The tin(IV) atom in the complex anion of the title salt, (C4H7N2)[Sn(C2O4)Cl3(H2O)], is in a distorted octa­hedral coordination environment defined by three chlorido ligands, an oxygen atom from a water mol­ecule and two oxygen atoms from a chelating oxalate anion. The organic cation is linked through a bifurcated N-HO hydrogen bond to the free oxygen atoms of the oxalate ligand of the complex [Sn(H2O)Cl3(C2O4)]- anion. Neighbouring stannate(IV) anions are linked through O-HO hydrogen bonds involving the water mol­ecule and the two non-coordinating oxalate oxygen atoms. In combination with additional N-HCl hydrogen bonds between cations and anions, a three-dimensional network is spanned.
    05/2015; 71(5):520-522. DOI:10.1107/S2056989015005988
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    ABSTRACT: Reaction of oxalic acid and di-phenyl-tin dichloride in the presence of cyclo-hexyl-amine led to the formation of the title salt, (C6H14N)2[Sn(C6H5)2(C2O4)2]. The dianion is made up from an Sn(C6H5)2 moiety cis-coordinated by two chelating oxalate anions, leading to an overall distorted octa-hedral coordination geometry of the Sn(IV) atom. The negative charges are compensated by two surrounding cyclo-hexyl-ammonium cations adopting chair conformations each. In the crystal, anions and cations are linked via a network of N-H⋯O hydrogen bonds into a layered arrangement parallel to (101).
    02/2015; 71(Pt 2):151-3. DOI:10.1107/S2056989014027716
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    ABSTRACT: The title compound, (C6H14N)2[Sn(C6H5)2Cl4], contains cyclo-hexyl-ammonium cations in general positions and a stannate(IV) anion that is located on a twofold rotation axis. The Sn(IV) atom in the complex anion is surrounded by four Cl(-) ligands and two trans-phenyl groups in a distorted octa-hedral configuration. The anions are connected with the cations through N-H⋯Cl hydrogen bonds. Every cation is involved in three N-H⋯Cl bonds to the chloride ligands of three different anions, and each chloride ligand is linked to two cations. This arrangement leads to a layered structure parallel to (010).
    Acta Crystallographica Section E Structure Reports Online 06/2014; 70(Pt 6):m220-1. DOI:10.1107/S160053681401109X · 0.35 Impact Factor
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    ABSTRACT: 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 tetra-hedral environment, with angles ranging from 107.7 to 111.16 (10)°. In the crystal, the tri-benzyl-ammonium 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.
    Acta Crystallographica Section E Structure Reports Online 05/2014; 70(Pt 5):o618-9. DOI:10.1107/S1600536814009246 · 0.35 Impact Factor
  • Y Sow, L Diop, JD Ardisson
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    ABSTRACT: Two new oxalato chloridodiorganostannic adducts have been synthesized, their elemental analyses performed, infrared and Mossbauer studies carried out. Discrete cages or a double discrete cages structures have been suggested, the oxalate behaving as a monocoordinating or a monochelating donor. The key role of R2NH2+ cations, involved in NH…O hydrogen bonds is noteworthy.© 2013 International Formulae Group. All rights reserved.
    03/2014; 7(5):2133. DOI:10.4314/ijbcs.v7i5.29
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    ABSTRACT: In the title dihydrate salt, 2C12H24N+·SO4 2−·2H2O, the cation possesses twofold rotational symmetry, with the N atom situated on the twofold axis. The sulfate anion has fourfold roto-inversion symmetry, with the S atom located on the -4 axis. In the crystal, the components are linked via ammonium–sulfate N—H⋯O and water–sulfate O—H⋯O hydrogen bonds, forming a three-dimensional network.
    Acta Crystallographica Section E Structure Reports Online 03/2014; 70(Pt 3):o237. DOI:10.1107/S1600536814000968 · 0.35 Impact Factor
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    ABSTRACT: The title compound, [Sn(C6H5)2Cl2(CH4N2S)2], has been obtained from the reaction between Sn(C6H5)2Cl2 and SC(NH2)2. The asymmetric unit consists of one half of the mol­ecular unit, the remainder generated by a twofold rotation axis located along the Cl—Sn—Cl bonds. The SnIV atom is coordinated by two phenyl groups, two Cl atoms and two thio­urea ligands in an all trans octa­hedral C2Cl2S2 environment. Individual mol­ecules are connected through N—H⋯Cl hydrogen bonds, leading to a three-dimensional network structure. Intra­molecular N—H⋯Cl hydrogen bonds are also present.
    Acta Crystallographica Section E Structure Reports Online 02/2014; 70(3). DOI:10.1107/S1600536814002025 · 0.35 Impact Factor
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    ABSTRACT: In the title salt, [(CH3CH2CH2)2NH2]4[Sn(C2O4)4]·H2O, 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 di-propyl-ammonium cation possesses mirror symmetry while the lattice water mol-ecule 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 mol-ecules and oxalate O atoms. The crystal studied was refined as an inversion twin.
    Acta Crystallographica Section E Structure Reports Online 02/2014; 70(Pt 2):m49-50. DOI:10.1107/S160053681303496X · 0.35 Impact Factor
  • 01/2014; 37(3-4). DOI:10.1515/mgmc-2014-0011
  • 01/2014; 37(1-2). DOI:10.1515/mgmc-2013-0058
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    ABSTRACT: In the title compound, [N(C4H9)4][Sn(C4H9)Cl4], the SnIV atom of the stannate anion has a trigonal-bipyramidal coordination sphere by two Cl atoms and one butyl chain in the equatorial plane and by two Cl atoms in the apical positions. Two of the four butyl chains of the tetra­butyl­ammonium cation are partially disordered, each with refined site occupancies of 0.691 (6):0.309 (6). Weak C—H⋯Cl hydrogen-bonding inter­actions help to consolidate the crystal packing, as well as a short Cl⋯Cl inter­action of 3.295 (2) Å.
    Acta Crystallographica Section E Structure Reports Online 09/2013; 69(10). DOI:10.1107/S1600536813026172 · 0.35 Impact Factor
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    ABSTRACT: The title compound, [Sn(C6H5)2Cl2(CH4N2S)2], has been obtained from the reaction between Sn(C6H5)2Cl2 and SC(NH2)2. The asymmetric unit consists of one half of the mol­ecular unit, the remainder generated by a twofold rotation axis located along the Cl—Sn—Cl bonds. The SnIV atom is coordinated by two phenyl groups, two Cl atoms and two thio­urea ligands in an all trans octa­hedral C2Cl2S2 environment. Individual mol­ecules are connected through N—H⋯Cl hydrogen bonds, leading to a three-dimensional network structure. Intra­molecular N—H⋯Cl hydrogen bonds are also present.
    Acta Crystallographica Section E Structure Reports Online 09/2013; 69(10). DOI:10.1107/S1600536813024343 · 0.35 Impact Factor
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    ABSTRACT: Four new phenylphosphonato SnR3 (R=Ph, Me) derivatives have been synthesized and characterized by infrared and Mössbauer spectroscopy. The structure of catena-poly[PhPO3HSnMe3]n has been determined by single-crystal X-ray diffraction analysis. The SnIV atoms are five-coordinated in all compounds, with the SnC3O2 framework in a trans trigonal bipyramidal arrangement and the PhPO3H- anions being in axial positions. The molecular structure of [PhPO3HSnMe3]n is arranged as a one-dimensional coordination polymer in which planar SnMe3 groups are axially bridged by -O-P-O- linkages of the PhPO3H- ligand. Neighboring chains are linked via O-H∙∙∙O hydrogen bond interactions, generating a layered structure. In the R2NH2(PhPO3H)2SnR′3 (R=Cy, Bu; R′=Ph, Me), the SnPh3 or SnMe3 residue is axially coordinated by two monodentate PhPO3H-. The role of the dialkylammonium cation, R2NH2+, is crucial in the lattice building via a hydrogen bond network. These hydrogen bonds contribute to the crystal stability and compactness and result in a three-dimensional arrangement. The aqua complex PhPO3(SnPh3)2·2H2O has a discrete structure and the anion PhPO32- behaves as a bidentate ligand.
    03/2013; 36(1-2). DOI:10.1515/mgmc-2012-0038
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    ABSTRACT: Crystals of the title salt, C21H20OP+·NO3 −, are composed of acetonyltriphenyl­phospho­nium cations and nitrate anions that mainly inter­act through electrostatic forces. The P atom in the cation has a slightly distorted tetra­hedral environment, with C—P—C angles ranging from 104.79 (7) to 112.59 (6)°. The sum of O—N—O angles of the nitrate anion is 359.99°, reflecting its trigonal–planar character. C—H⋯O hydrogen bonds help to consolidate the crystal packing.
    Acta Crystallographica Section E Structure Reports Online 02/2013; 69(Pt 2):o303. DOI:10.1107/S1600536813002110 · 0.35 Impact Factor
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    ABSTRACT: The Sn(IV) atom in the title compound, [(CH(3))(4)N][Sn(C(2)O(4))Cl(3)(H(2)O)]·H(2)O, obtained from the reaction between SnCl(4) and [(CH(3))(4)N](2)C(2)O(4)·2H(2)O, is six-coordinated by three Cl atoms, an O atom of a water mol-ecule and two O atoms from an asymmetrically chelating oxalate anion. The environment around the Sn(IV) atom is distorted octa-hedral. The anions are connected by the lattice water mol-ecule 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 inter-actions.
    Acta Crystallographica Section E Structure Reports Online 02/2013; 69(Pt 2):m106-7. DOI:10.1107/S1600536813000895 · 0.35 Impact Factor
  • 01/2013; 36(5-6). DOI:10.1515/mgmc-2013-0019
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    ABSTRACT: The title compound, [Sn(C6H5)2Cl2(CH4N2S)2], has been obtained from the reaction between Sn(C6H5)2Cl2 and SC(NH2)2. The asymmetric unit consists of one half of the mol-ecular unit, the remainder generated by a twofold rotation axis located along the Cl-Sn-Cl bonds. The Sn(IV) atom is coordinated by two phenyl groups, two Cl atoms and two thio-urea ligands in an all trans octa-hedral C2Cl2S2 environment. Individual mol-ecules are connected through N-H⋯Cl hydrogen bonds, leading to a three-dimensional network structure. Intra-molecular N-H⋯Cl hydrogen bonds are also present.
    Acta Crystallographica Section E Structure Reports Online 01/2013; 69(Pt 10):m539-m540. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, [N(C4H9)4][Sn(C4H9)Cl4], the Sn(IV) atom of the stannate anion has a trigonal-bipyramidal coordination sphere by two Cl atoms and one butyl chain in the equatorial plane and by two Cl atoms in the apical positions. Two of the four butyl chains of the tetra-butyl-ammonium cation are partially disordered, each with refined site occupancies of 0.691 (6):0.309 (6). Weak C-H⋯Cl hydrogen-bonding inter-actions help to consolidate the crystal packing, as well as a short Cl⋯Cl inter-action of 3.295 (2) Å.
    Acta Crystallographica Section E Structure Reports Online 01/2013; 69(Pt 10):m562-m563. · 0.35 Impact Factor
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    ABSTRACT: Four new di- and triorganonitrato stannate complexes and related derivatives have been synthesized and characterized by infrared and Mössbauer spectroscopy. The structure of Et4N[NO3(SnClPh3)2(SnPh3NO3)] (1) has been determined by single-crystal X-ray diffraction analysis. In the trinuclear organostannate complex, each SnIV atom is five-coordinated and adopts a trigonal-bipyramidal trans-OXSnC3 (X=O or Cl) geometry. The overall coordination environment of the SnIV atoms is trans-octahedral for 2 and 3 or cis-trigonal-bipyramidal for 4. In the related derivatives, the NO3- anions behave as monodentate ligands.
    01/2013; 36(3-4). DOI:10.1515/mgmc-2013-0009
  • 01/2013; 36(5-6). DOI:10.1515/mgmc-2013-0033