Displaying publications 161 - 180 of 692 in total

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  1. Keng TC, Lo KM, Ng SW
    PMID: 21754573 DOI: 10.1107/S1600536811015716
    The dinuclear title complex, [Sn(2)(C(7)H(6)Cl)(4)(C(9)H(16)NO(2)S(2))(4)], lies on a center of inversion. The Sn(IV) atoms are chelated by one of the two carboxyl-ate ions; the other carboxyl-ate ion bridges two metal atoms. The geometry of the six-coordinate Sn(IV) atom is a distorted trans-C(2)SnO(4) octa-hedron [C-Sn-C = 155.32 (8)°].
  2. Keng TC, Lo KM, Ng SW
    PMID: 21754576 DOI: 10.1107/S1600536811015741
    The Sn(IV) atom in the title compound, [Sn(C(7)H(6)Cl)(3)(C(10)H(9)O(2))], exists in a tetra-hedral geometry [Σ C-Sn-C = 341.5 (4)°]. If the doubly bonded carbonyl O atom is taken into account for the coordination sphere of Sn [Sn⋯O = 2.808 (2) Å], the coordination geometry can be described as a cis-penta-gonal bipyramid.
  3. Keng TC, Lo KM, Ng SW
    PMID: 21754575 DOI: 10.1107/S160053681101573X
    The Sn(IV) atom in the three independent mol-ecules of the title compound, [Sn(C(7)H(6)Cl)(2)(C(9)H(6)NO)Cl], is N,O-chelated by the quinolin-8-olate anion and exists in a cis-C(2)SnNOCl trigonal-bipyramidal geometry; the O atom of the anion and the two benzyl C atoms lie in the equatorial plane.
  4. Keng TC, Lo KM, Ng SW
    PMID: 21754572 DOI: 10.1107/S1600536811015704
    The six-coordinate Sn(IV) atom in the title compound, [SnCl(4)(C(14)H(14)OS)(2)], exists in a cis-SnCl(4)O(2) octa-hedral geometry. Of the four Cl atoms, two are close to adjacent S atoms [Cl⋯S = 3.320 (1) and 3.376 (1) Å]; the Sn-Cl bonds involving these two Cl atoms are longer than the other two Sn-Cl bonds.
  5. Keng TC, Lo KM, Ng SW
    PMID: 21754571 DOI: 10.1107/S1600536811015698
    The six-coordinate Sn(IV) atom in the title compound, [Sn(C(8)H(9))Cl(3)(C(3)H(4)N(2))(2)], shows an octa-hedral coordination. The N atoms of the N-heterocycle are cis to each other. The Sn-N bond that is trans to the Sn-C bond is shorter than the Sn-N bond trans to the Sn-Cl bond. Weak N-H⋯Cl hydrogen bonds link adjacent mol-ecules, generating a double chain running along the c axis.
  6. Karimnejad K, Khaledi H, Mohd Ali H
    PMID: 21753950 DOI: 10.1107/S1600536811008166
    In the title compound, [Zn(C(6)H(14)N(2))(2)(H(2)O)(2)]Cl(2), the Zn(II) atom resides on a special position with site symmetry 2/m and is octa-hedrally coordinated by four N atoms from two trans 1,2-diamino-cyclo-hexane ligands and two water O atoms. In the crystal, N-H⋯Cl and O-H⋯Cl hydrogen bonds link the mol-ecules into a two-dimensional network parallel to the bc plane.
  7. 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.
  8. Lee SM, Lo KM, Ng SW
    Acta Crystallogr Sect E Struct Rep Online, 2011 Jun 01;67(Pt 6):m746.
    PMID: 21754637 DOI: 10.1107/S1600536811017648
    The Mn(III) atom in the title complex, [Mn(C(18)H(18)N(2)O(4))(CHO(2))(H(2)O)]·2H(2)O, is O,N,N',O'-chelated by the deproton-ated Schiff base; the four chelating atoms form an approximate square, with the O atoms of the water mol-ecule and the formate ion in axial positions above and below the square plane. Two metal-bearing mol-ecules are linked by an O-H(water)⋯O hydrogen bond about a center of inversion, generating a hydrogen-bonded dinuclear species; adjacent dinuclear units are linked through the lattice water mol-ecules, forming a three-dimensional network.
  9. 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.
  10. Wong HW, Lo KM, Ng SW
    PMID: 21754676 DOI: 10.1107/S1600536811019106
    The V(V) atom in the polymeric title compound, [NaV(C(15)H(13)N(3)O(3))O(2)(H(2)O)(2)](n), is O,N,O'-chelated by the Schiff base dianion and is five-coordinated in a trigonal-bipramidal coordination geometry. The oxide O atoms occupy the equatorial sites and one oxide O atom is connected to the Na(I) atom. The ligand simultaneously O,O'-chelates to the water-coordinated Na(I) atom; its coordination number is seven owing to an Na⋯N(pyrid-yl) bond. The two independent formula units, which are disposed about a false center of inversion, are connected into a layer. Adjacent layers are consolidated into a three-dimensional network by O-H⋯O and O-H⋯N hydrogen bonds.
  11. Ngan NK, Wong RC, Lo KM, Ng SW
    PMID: 21754639 DOI: 10.1107/S1600536811017260
    The Mo(VI) atom in the title co-crystal, [Mo(C(14)H(12)N(2)O(4))O(2)(H(2)O)]·0.5C(10)H(8)N(2), is O,N,O'-chelated by the deprotonated Schiff base and coordinated by the oxide and water O atoms in an octa-hedral geometry. The five-membered chelate ring is planar (r.m.s. deviation = 0.019 Å), but the six-membered chelate ring is puckered (r.m.s. deviation = 0.108 Å). Two mononuclear mol-ecules are linked across a center of inversion by an O-H(water)⋯O hydrogen bond; adjacent dinuclear units are linked by an water-4,4'-bipyridine O-H⋯N hydrogen bond, generating a linear chain structure. The 4,4'-bipyridine mol-ecule is disordered over two positions in a 1:1 ratio.
  12. Cheng SF, Ng SW
    Acta Crystallogr Sect E Struct Rep Online, 2011 Jun 01;67(Pt 6):o1306.
    PMID: 21754708 DOI: 10.1107/S1600536811015972
    In the title hydrated molecular salt, C(12)H(9)N(2) (+)·C(4)H(5)O(6) (-)·2H(2)O, the cation is almost planar (r.m.s. deviation = 0.014 Å); the carbon skeleton of the anion assumes a trans conformation [C-C-C-C torsion angle = -179.86 (14)°]. The carboxyl end of one hydrogen tartrate anion forms a short hydrogen bond to the carboxyl-ate end of another anion [O⋯O = 2.508 (2) Å] in a head-to-tail manner, forming a chain; the chains and water mol-ecules inter-act, generating an O-H⋯O hydrogen-bonded layer. The cation binds to the layer by an N-H⋯O hydrogen bond.
  13. Yamin BM, Osman UM
    Acta Crystallogr Sect E Struct Rep Online, 2011 Jun 1;67(Pt 6):o1286.
    PMID: 21754693 DOI: 10.1107/S1600536811014954
    In the title compound, C(22)H(17)ClN(4)O(2)S(2), both benzoyl groups are trans to the thiono group across their C-N bonds. The two methyl-ene carbamothioyl formamide fragments of the benzoyl-thio-urea side arms make a dihedral angle of 87.00 (10)°. The mol-ecule is stabilized by intra-molecular N-H⋯O, N-H⋯S and C-H⋯·S hydrogen bonds. In the crystal, mol-ecules are linked by N-H⋯O and N-H⋯S inter-molecular hydrogen bonds into zigzag chains along the a axis.
  14. Ng SW
    Acta Crystallogr Sect E Struct Rep Online, 2011 Jun 1;67(Pt 6):m811-2.
    PMID: 21754685 DOI: 10.1107/S1600536811019696
    In the title ammonium polyoxometallate salt, (C(6)H(16)N)(4)[H(2)V(10)O(28)], the anion features O atoms engaged in μ(6)-, μ(3)- and μ(2)-bridging of adjacent V(V) atoms, confering an octa-hedral coordination at each of the twenty unique metal atoms. Two anions are linked by μ(3)- and μ(2)-bridged OH units across a center of inversion, forming a dimer which is linked to the cations by N-H⋯O hydrogen bonds. The cation is disordered over two positions in a 0.776 (4):0.224 (4) ratio in one of the two independent ion pairs in the asymmetric unit, and 0.627 (10):0.373 (10) in the other.
  15. Lo KM, Ng SW
    PMID: 21754684 DOI: 10.1107/S160053681101957X
    In the title tribenzyl-chloridotin-triphenyl-phosphine adduct, [Sn(C(7)H(7))(3)Cl(C(18)H(15)OP)], the Sn(IV) atom is in a trans-C(3)SnClO trigonal-bipyramidal geometry and is displaced out of the C(3)Sn girdle in the direction of the axial Cl atom by 0.112 (1) in one independent mol-ecule and by 0.167 (1) Å in the other. The phenyl ring of one of the six benzyl units was refined as equally disordered over two sets of sites.
  16. Lo KM, Ng SW
    Acta Crystallogr Sect E Struct Rep Online, 2011 Jun 1;67(Pt 6):o1453.
    PMID: 21754827 DOI: 10.1107/S160053681101796X
    In the title compound, C(10)H(12)ClN(3)OS, the -C=N-N-C- chain bridging the ethyl-imino group and the benzene ring adopts an extended conformation with a C-N-N-C torsion angle of -171.98 (11)°. The imino H atom of the chain is a hydrogen-bond donor to the S atom of an inversion-related mol-ecule, forming a supra-molecular dimer. The hy-droxy H atom is intra-molecularly hydrogen bonded to the azomethine N atom.
  17. Lo KM, Ng SW
    Acta Crystallogr Sect E Struct Rep Online, 2011 Jun 1;67(Pt 6):o1452.
    PMID: 21754826 DOI: 10.1107/S1600536811017958
    In the title Schiff base mol-ecule, C(13)H(11)ClN(2)O, the non-H atoms are approximately coplanar (r.m.s. deviation = 0.115 Å) and the two benzene rings are twisted by 9.36 (3)° with respect to each other. The hy-droxy group is hydrogen bonded to the azomethine N atom. In the crystal, an N-H⋯π inter-action is observed between the imino group and the hy-droxy-benzene ring of an adjacent mol-ecule.
  18. Hemamalini M, Goh JH, Fun HK
    PMID: 22259470 DOI: 10.1107/S1600536811053025
    In the title mol-ecular salt-adduct, C(5)H(8)N(3) (+)·C(6)H(7)O(2) (-)·C(6)H(8)O(2), the 2,3-diamino-pyridinium cation is essentially planar, with a maximum deviation of 0.013 (2) Å, and is protanated at its pyridine N atom. The sorbate anion and sorbic acid mol-ecules exist in extended conformations. In the crystal, the protonated N atom and one of the two amino-group H atoms are hydrogen bonded to the sorbate anion through a pair of N-H⋯O hydrogen bonds, forming an R(1) (2)(6) ring motif. The carboxyl groups of the sorbic acid mol-ecules and the carboxyl-ate groups of the sorbate anions are connected via O-H⋯O hydrogen bonds. Furthermore, the ion pairs and neutral mol-ecules are connected via inter-molecular N-H⋯O hydrogen bonds, forming sheets lying parallel to (100).
  19. Al-Mehana WN, Yahya R, Lo KM
    PMID: 22219934 DOI: 10.1107/S160053681104102X
    The mol-ecule of the title compound, C(20)H(16)N(2)O(2), is centrosymmetric with the mid-point of the central N-N bond located on an inversion center. The configuration around the C=N bond is E. The whole mol-ecule (except for the H atoms) is approximately planar, with an r.m.s. deviation of 0.07 Å. In the crystal, the presence of weak inter-molecular C-H⋯O hydrogen bonding involving each acetyl-ene H atom and the adjacent phen-oxy O atom results in the formation of supra-molecular chains.
  20. Kwong HC, Rahman MZ, Mohamed Tahir MI, Silong S
    PMID: 22220018 DOI: 10.1107/S1600536811041602
    In the title compound, C(19)H(29)NO, the C-C and C-N bond distances of the benzonitrile group are 1.445 (2) and 1.157 (2) Å, respectively. The aliphatic fragment adopts a bent zigzag arangement which differs from the planar zigzag arrangement normally observed in n-alkanes or long-chain alkyl-benzenes. In the crystal, inversion dimers linked by pairs of C-H⋯O hydrogen bonds occur. A C-H⋯N inter-action also occurs. In the crystal, mol-ecules are packed with the nitrile and aliphatic groups oriented in a head-to-tail fashion involving, forming a ripple-like motif along the a axis.
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