Libasse Diop

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

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Publications (50)26.37 Total impact

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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. · 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. · 0.35 Impact Factor
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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. · 0.35 Impact Factor
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    ABSTRACT: The title compound, [Sn(CH3)2Cl2(CH4N2S)2], crystallizes with two half-mol­ecules in the asymmetric unit. Both mol­ecules are completed by inversion symmetry with the two SnIV atoms located on inversion centers. The metal atoms have distorted octa­hedral coordination environments defined by two Cl atoms, two C atoms of methyl groups and two thio­urea S atoms. In the crystal, mol­ecules are linked via N—H⋯Cl and N—H⋯S hydrogen bonds, forming a three-dimensional structure.
    Acta Crystallographica Section E Structure Reports Online 02/2014; 70(3). · 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. · 0.35 Impact Factor
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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). · 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). · 0.35 Impact Factor
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    ABSTRACT: Crystals of the title salt, C(21)H(20)OP(+)·NO(3) (-), are composed of acetonyltriphenyl-phospho-nium cations and nitrate anions that mainly inter-act through electrostatic forces. The P atom in the cation has a slightly distorted tetra-hedral 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. · 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. · 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 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: The crystal structure of the title salt, (CHP)[Sn(CH)Cl] or (PhCHPPh)[SnPhCl], consists of [PhCHPPh] cations and [SnPhCl] anions in which the Sn atom is linked to two Cl atoms and three phenyl groups in a trigonal-bipyramidal geometry, with the Cl atoms in positions. The cation adopts a tetra-hedral geometry. In the crystal, the cations and the anions are connected by C-H⋯Cl hydrogen bonds, leading to an infinite chain propagating along the direction.
    Acta Crystallographica Section E Structure Reports Online 01/2013; 69(Pt 1):m42. · 0.35 Impact Factor
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    ABSTRACT: The crystal structure of the title salt, (C25H22P)[Sn(C6H5)3Cl2] or (PhCH2PPh3)[SnPh3Cl2], consists of [PhCH2PPh3]+ cations and [SnPh3Cl2]− anions in which the SnIV atom is linked to two Cl atoms and three phenyl groups in a trigonal–bipyramidal geometry, with the Cl atoms in trans positions. The cation adopts a tetra­hedral geometry. In the crystal, the cations and the anions are connected by C—H⋯Cl hydrogen bonds, leading to an infinite chain propagating along the c direction.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 69(1). · 0.35 Impact Factor
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    ABSTRACT: The Sn atom in the centrosymmetric title complex, [Sn(CH)(NCS)(OH)], adopts a distorted trigonal-bipyramidal coordination environment defined by two methyl C atoms and one bridging hydroxide group in the equatorial plane while the other bridging hydroxide group and the N atom of the thio-cyanate anion are in the apical >positions. The dinuclear species are linked through O-H⋯S and C-H⋯ S hydrogen-bonding inter-actions into a three-dimensional network.
    Acta Crystallographica Section E Structure Reports Online 12/2012; 68(Pt 12):m1436. · 0.35 Impact Factor
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    ABSTRACT: In the title compound, [Sn(2)(C(4)H(9))(4)(C(6)H(6)PO(3))(4)](n), the basic unit is a dimer containing two symmetry-related Sn(IV) atoms bridged by two hydrogenphenylphosphonate anions. This fragment is located about an inversion center, and each Sn(IV) atom is linked to two other hydrogenphenylphosphonate anions, giving a layered structure parallel to (010). The coordination geometry for the Sn(IV) atoms is close to octa-hedral. The layers are connected via O-H⋯O hydrogen bonds, generating a three-dimensional network. One butyl group is disordered over two sets of sites, with occupancies of 0.49 (2) and 0.51 (2).
    Acta Crystallographica Section E Structure Reports Online 11/2012; 68(Pt 11):m1334. · 0.35 Impact Factor
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    Tidiane Diop, Libasse Diop, Arie van Lee
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    ABSTRACT: In the structure of the title coordination polymer, {(C(8)H(20)N)[Sn(3)(CH(3))(9)(SO(4))(2)]}(n), each of the three Sn(IV) atoms is coordinated in a trigonal-bipyramidal manner by three methyl groups in the equatorial plane and by two O atoms of SO(4) (2-) anions in the axial positions. The μ(3)-bridging mode of the sulfate anions leads to the formation of corrugated anionic layers parallel to (100). The uncoordinating O atom of one of the two SO(4) (2-) anions is N-H⋯O hydrogen-bonded to the dibutyl-ammonium cation inter-connecting the anionic sheets. The structure is partially disordered. The dibutyl ammonium ion is found on two positions with an occupancy ratio of 0.525 (10):0.475 (10), and one sulfate group with three connecting trimethyl stannyl groups is also positionally disordered over two sets of sites with an occupancy ratio of 0.725 (4):0.275 (4).
    Acta Crystallographica Section E Structure Reports Online 11/2012; 68(Pt 11):m1380-1. · 0.35 Impact Factor
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    ABSTRACT: The asymmetric unit of the binuclear title compound, [Sn(2)(C(2)O(4))(C(6)H(5))(6)(CH(4)N(2)S)(2)], consists of one half of the organotin(IV) mol-ecule. The remainder is generated by a twofold rotation axis passing through the mid-point of the oxalate C-C bond. The Sn(IV) atom exhibits a distorted trigonal-bipyramidal coordination environment with the phenyl groups in equatorial positions and the thio-urea and the monodentately bridging oxalate anion in axial positions. The mol-ecules are linked through N-H⋯O hydrogen bonds involving the amino group of the thio-urea ligand and the uncoordinating oxalate O atoms, forming layers parallel to (001). Weak C-H⋯O inter-actions are also present.
    Acta Crystallographica Section E Structure Reports Online 11/2012; 68(Pt 11):m1337. · 0.35 Impact Factor
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    ABSTRACT: In the structure of the title coordination polymer, {(C8H20N)[Sn3(CH3)9(SO4)2]}n, each of the three SnIV atoms is coordinated in a trigonal–bipyramidal manner by three methyl groups in the equatorial plane and by two O atoms of SO42− anions in the axial positions. The μ3-bridging mode of the sulfate anions leads to the formation of corrugated anionic layers parallel to (100). The uncoordinating O atom of one of the two SO42− anions is N—H⋯O hydrogen-bonded to the dibutyl­ammonium cation inter­connecting the anionic sheets. The structure is partially disordered. The dibutyl ammonium ion is found on two positions with an occupancy ratio of 0.525 (10):0.475 (10), and one sulfate group with three connecting trimethyl stannyl groups is also positionally disordered over two sets of sites with an occupancy ratio of 0.725 (4):0.275 (4).
    Acta Crystallographica Section E Structure Reports Online 10/2012; 68(11). · 0.35 Impact Factor
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    ABSTRACT: The asymmetric unit of the binuclear title compound, [Sn2(C2O4)(C6H5)6(CH4N2S)2], consists of one half of the organotin(IV) mol­ecule. The remainder is generated by a twofold rotation axis passing through the mid-point of the oxalate C—C bond. The SnIV atom exhibits a distorted trigonal–bipyramidal coordination environment with the phenyl groups in equatorial positions and the thio­urea and the monodentately bridging oxalate anion in axial positions. The mol­ecules are linked through N—H⋯O hydrogen bonds involving the amino group of the thio­urea ligand and the uncoordinating oxalate O atoms, forming layers parallel to (001). Weak C—H⋯O inter­actions are also present.
    Acta Crystallographica Section E Structure Reports Online 10/2012; 68(11). · 0.35 Impact Factor
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    ABSTRACT: The asymmetric unit of the title organotin salt, (C(8)H(20)N)[Sn(C(6)H(5))(3)(CH(4)O(3)P)(2)], contains two dibutyl-ammonium cations and two stannate(IV) anions consisting each of two monodentately bonding methyl hydrogenphosphate groups attached to an Sn(C(6)H(5)) unit. The overall coordination environment of the two Sn(IV) atoms is trigonal-bipyramidal defined by three phenyl C atoms in equatorial positions and two methyl hydrogenphosphate O atoms at the apical sites. In the crystal, the stannate(IV) anions are linked to each other via pairs of short O-H⋯O hydrogen bonds, leading to an infinite chain extending parallel to the b-axis direction. Neighbouring chains are linked by N-H⋯O hydrogen bonds involving the butyl-ammonium cations, giving a two-dimensional structure parallel to the ab plane. The crystal under investigation was found to be twinned by reticular merohedry with twin fractions of 0.5342 (7):0.4658 (7).
    Acta Crystallographica Section E Structure Reports Online 10/2012; 68(Pt 10):m1284-5. · 0.35 Impact Factor