Displaying publications 21 - 40 of 692 in total

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  1. Ngan NK, Lo KM, Richard Wong CS
    PMID: 21836856 DOI: 10.1107/S1600536811020290
    The coordination geometry at the Mo(VI) atom in the title compound, [Mo(C(16)H(14)N(2)O(4))O(2)(C(2)H(6)OS)], is distorted octa-hedral. The phenolate O, imino N, oxide O from the enolized carbonyl group and one of the terminal O atoms form the equatorial plane; the axial positions are occupied by the other terminal O atom of the dioxidomolybdenum group and the donor O atom of DMSO. The O=Mo=O angle is 105.31 (6)°. An intra-molecular O-H⋯N hydrogen bond and weak inter-molecular C-H⋯O hydrogen bonds are present in the structure.
  2. Lo KM, Ng SW
    PMID: 21580250 DOI: 10.1107/S1600536810005817
    In the title salt, (C(9)H(14)N)[CdBr(2)Cl], the Cd(II) atom is five-coordinated in a trigonal-bipyramidal coordination environment. All three of the halogen sites show disorder as a result of substitution of Cl for Br or Br for Cl. Two of the three halogen atoms are involved in bridging a pair of Cd(II) atoms, generating a linear polyanionic chain motif.
  3. Suleiman Gwaram N, Khaledi H, Mohd Ali H
    PMID: 21753992 DOI: 10.1107/S1600536811010063
    In the title compound, [Cd(NCS)(2)(C(11)H(17)N(3))](n), the Cd(II) atom is octa-hedrally coordinated by the N,N',N''-tridentate Schiff base ligand and one terminal thio-cyanate N atom. Two trans-N:S-bridging thio-cyanates complete the N(5)S donor set around the Cd atom. In the crystal, adjacent Cd(II) ions are linked by the thio-cyanate N:S-bridges into polymeric chains along the c axis.
  4. Keng TC, Lo KM, Ng SW
    PMID: 21580254 DOI: 10.1107/S1600536810005933
    In the title compound, [Sn(C(7)H(6)F)(3)(C(9)H(16)NO(2)S(2))](n), the Sn atom is coordinated in a slightly distorted, trans-C(3)SnO(2) trigonal-bipyramidal environment. Symmetry-related Sn atoms are bridged by diisopropyl-dithio-carbamoylacetato ligands, forming a one-dimensional polymer along [001].
  5. Keng CT, Lo KM, Ng SW
    PMID: 21588202 DOI: 10.1107/S1600536810028321
    Adjacent units of the title polymeric complex, [Sn(C(7)H(6)F)(3)(C(8)H(12)NO(2)S(2))], are bridged by the carboxyl-ate ion into a helical chain running along the b axis. The Sn(IV) atom shows a distorted trans-C(3)SnO(2) trigonal-bipyramidal coordination and is displaced by 0.113 (2) Å out of the C(3)Sn girdle in the direction of the covalently bonded O atom. The ring is disordered of two positions with an occupancy of 0.631 (4) for the major occupied site.
  6. Lee SM, Lo KM, Mohd Ali H, Robinson WT
    PMID: 21582732 DOI: 10.1107/S1600536809023150
    The title compound, [Sn(C(6)H(5))(3)(C(17)H(25)O(3)S)](n), comprises two symmetry-independent five-coordinated triphenyl-tin mol-ecules which are linked by carboxyl-ate bridges into a polymeric chain. The Sn(IV) atom is in a distorted trans-C(3)SnO(2) trigonal-bipyramidal geometry. The presence of two bulky tert-butyl groups on the benzene ring prevents any hydrogen-bonding inter-actions involving the hydroxyl substituents.
  7. Thong PY, Lo KM, Ng SW
    PMID: 21580842 DOI: 10.1107/S1600536808032236
    The 4-nitro-cinnamate anion in the title compound, [Sn(C(7)H(7))(3)(C(9)H(6)NO(4))](n), bridges adjacent tribenzyl-tin cations into a helical chain running along the b axis. The Sn atoms in the two independent mol-ecules adopt distorted trans-C(3)SnO(2) trigonal-bipyramidal geometries. The repeat distance of the polymeric chain is b/2.
  8. Keng TC, Lo KM, Ng SW
    PMID: 21754610 DOI: 10.1107/S1600536811016436
    The formyl-meth-oxy-nitro-phenoxide ions in the polymeric title compound, [Sn(C(7)H(7))(3)(C(8)H(6)NO(5))](n), link adjacent triorganotin(IV) cations into linear chains lying close to (101) [Sn-O = 2.1227 (12) Å and Sn← O = 2.4936 (13) Å]. The Sn(IV) atom is displaced out of the C(3)Sn girdle of the trans-C(3)SnO(2) trigonal-bipyramidal polyhedron in the direction of the covalently-bonded O atom [Sn-O-C = 137.63 (11)°] by 0.247 (1) Å; the geometry is distorted towards an octa-hedron by a remote O atom of the meth-oxy subsituent [Sn⋯O = 3.019 (1) Å].
  9. Keng TC, Lo KM, Ng SW
    PMID: 21587378 DOI: 10.1107/S1600536810035221
    The Sn atom in the title polymeric compound, [Sn(C(7)H(7))(3)(C(8)H(12)NO(2)S(2))](n), exists in a trans-C(3)O(2) trigonal-bipyramidal coordination environment in the two independent formula units. The carboxyl-ate moiety functions in a bridging mode, linking adjacent triorganotin cations into a linear chain running along the shortest axis of the triclinic unit cell; the repeat distance of the polymer is half the a-axial length. In one formula unit, the Sn atom is displaced out of the equatorial plane in the direction of the Sn-O(covalent) bond by 0.093 (4) Å and in the second mol-ecule, the Sn atom is displaced by 0.105 (4) Å in the same direction.
  10. Lo KM, Ng SW
    Acta Crystallogr Sect E Struct Rep Online, 2011 Jun 1;67(Pt 6):m744-5.
    PMID: 21754636 DOI: 10.1107/S1600536811017247
    The Sn(IV) atom in the title carboxyl-ate-bridged polymer, [Sn(C(7)H(7))(3)(C(9)H(7)O(2))](n), exists in a trans-C(3)SnO(2) trigonal-bipyramidal geometry (average covalent Sn-O = 2.167 Å, average dative Sn-O = 2.361 Å and average O-Sn-O = 169.6°). The polymer propagates as a helical chain along the b axis with a repeat distance that is half the b-axial length. There are four independent formula units in the asymmetric unit; two are disposed about a false center of inversion with respect to the other two so that the space group emulates a centric space group.
  11. Keng TC, Lo KM, Ng SW
    PMID: 21836954 DOI: 10.1107/S1600536811023919
    In the title carboxyl-ate-bridged polymer, [Sn(C(7)H(7))(3)(C(7)H(5)O(3))](n), the Sn(IV) atom exists in a distorted trans-C(3)SnO(2) trigonal-bipyramidal geometry. The polymer propagates as a chain along the a axis. There are two independent formula units in the asymmetric unit; the furyl ring of one of the anions is disordered over two positions in a 0.630 (8):0.370 (8) ratio. The crystal studied was a non-merohedral twin with a minor twin domain of 37.3 (1)%.
  12. Tiekink ER
    PMID: 21578544 DOI: 10.1107/S1600536809047096
    The title supra-molecular polymer, [Cu(S(3)O(6))(H(2)O)(4)](n), features a tetra-gonally distorted octa-hedral Cu(II) centre within an O(6) donor set with the longer Cu-O bonds linking the dication and the trithio-nate dianion. Extensive O-H⋯O hydrogen-bonding inter-actions connect the supra-molecular chains into a three-dimensional network.
  13. Lo KM, Ng SW
    PMID: 21202249 DOI: 10.1107/S1600536808011100
    The title polymeric mixed-organyl tin hydroxide, [Sn(C(6)H(5))(2)(C(6)H(11))(OH)](n), hass a hydroxide-bridged chain structure; the tin center shows trans-C(3)SnO(2) trigonal bipyramidal coordination. The Sn atom lies on a special position of site symmetry m; the symmetry element relates one phenyl ring to the other and also relates one half of the cyclo-hexyl ring to the other half.
  14. Yamin BM, Ismail W, Daran JC
    Acta Crystallogr Sect E Struct Rep Online, 2012 Jul 1;68(Pt 7):m886-7.
    PMID: 22807730 DOI: 10.1107/S1600536812024932
    In the title compound, [Cu₂Cl₄(C₁₆H₃₂N₄)](n), the central Cu(II) anion of the macrocyclic complex cation is weakly linked to two Cl atoms of the tetrachloridocuprate anion with Cu-Cl distances of 3.008 (3) and 3.220 (3) Å, respectively, forming a chain parallel to [10-1]. The geometry of the Cu-macrocyclic complex is distorted octa-hedral with the bridging Cl atoms occupying the axial position at an angle of 173.44 (7)° about the central Cu(II) atom. The tetrachloridocuprate anion adopts a distorted tetra-hedral geometry. In the crystal, the chain is stabilized by intra- and inter-molecular N-H⋯Cl hydrogen bonds.
  15. Teo YY, Lo KM, Ng SW
    PMID: 21202479 DOI: 10.1107/S1600536808013202
    The mol-ecule of the dinuclear title compound, [Sn(2)(C(5)H(9))(2)(C(6)H(5))(4)(C(2)F(3)O(2))(2)(C(28)H(28)O(2)P(2))], lies on a center of inversion at the mid-point of the central C-C bond of the bridging phosphine oxide ligand. The Sn atom is five-coordinate in a trans-C(3)SnO(2) trigonal-bipyramidal geometry.
  16. Ngan NK, Wong RC, Lo KM, Ng SW
    PMID: 21754638 DOI: 10.1107/S1600536811017259
    In the title co-crystal, [Mo(C(14)H(9)ClN(2)O(4))O(2)(CH(3)OH)]·C(10)H(8)N(2), the deprotonated Schiff base O,N,O'-chelates to the Mo(VI) atom, the three atoms involved in chelation comprising the fac sites of the octa-hedron surrounding the methanol-coordinated metal atom. The methanol mol-ecule forms an O-H⋯N hydrogen bond to an N atom of the 4,4'-bipyridine solvent mol-ecule; the hy-droxy group of the Schiff base forms an O-H⋯N hydrogen bond to the other N atom of another mol-ecule. The two hydrogen bonds leading to the formation of a helical chain running along the b axis.
  17. Lee SM, Lo KM, Ali HM, Ng SW
    PMID: 21578694 DOI: 10.1107/S1600536809050107
    The Sn(IV) atom in the title compound, [Sn(C(6)H(5))(2)(C(18)H(11)ClN(2)O(3))], is O,N,O'-chelated by the deprotonated Schiff base ligand and further bonded by two phenyl rings in a distorted cis-C(2)SnNO(2) trigonal-bipyramidal geometry [C-Sn-C = 125.7 (2)°]. The two phenyl rings are oriented at a dihedral angle of 55.2 (3)°. Intra-molecular O-H⋯N hydrogen bonding is present in the crystal structure.
  18. Lee SM, Lo KM, Mohd Ali H, Ng SW
    PMID: 21582739 DOI: 10.1107/S1600536809022259
    The Sn(IV) atom in the title compound, [Sn(CH(3))(2)(C(18)H(11)ClN(2)O(3))], shows a trans-C(2)NO(2)Sn trigonal-bipyramidal coordin-ation; the axial O-Sn-O angle is 155.22 (5)°. The tridentate N'-(5-chloro-2-oxidobenzyl-idene)-3-hydr-oxy-2-naphthohydrazidate dianion is stabilized by an intra-molecular O-H⋯N hydrogen bond.
  19. Lee SM, Mohd Ali H, Lo KM
    PMID: 21579636 DOI: 10.1107/S1600536810001133
    The Sn(IV) atom in the title compound, [Sn(CH(3))(2)(C(18)H(11)BrN(2)O(3))], shows a distorted cis-C(2)NO(2)Sn trigonal-bipyramidal coordination geometry, with an axial O-Sn-O angle of 155.27 (9)°. The presence of an intra-molecular O-H⋯N hydrogen bond between the amido N atom and hydr-oxy H atom in the Schiff base ligand helps to stabilize the overall mol-ecular structure.
  20. Lee SM, Mohd Ali H, Lo KM
    PMID: 21579637 DOI: 10.1107/S1600536810001145
    The environment at the Sn(IV) atom in the title compound, [Sn(C(6)H(11))(2)(C(18)H(11)BrN(2)O(3))], is distorted trigonal-bipyramidal, with the two cyclo-hexyl groups and the imino N atom forming the equatorial plane. The axial O-Sn-O angle is 155.97 (9)°. The presence of an intra-molecular O-H⋯N hydrogen bond in the Schiff base ligand helps to stabilize the overall structure.
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